Develop Bugs

Upgrading Radio Rom Illegal ??

Hallo,
On the dutch forum of Qtek support forum.qtek.nl there is being claimed that upgrading the radio ROM is illegal.
Since I upgraded to Radio Rom 1.04.02 a few problems I had concerning bluetooth and GSM functions are resolved
So I find it strange that solutions to problems are illegal ?
Can anyone comment on this ?
Kind regards,
Scotty

I doubt that there is any case, for it to be considered illegal.
This is especially true since you are reffering to the Qtek (similarly to the i-mate, but possibly different than other versions of the Universal): your device is similar to any other device (or PC for that matter) that you buy - you may change, alter or add to its software, I guess - as long as you don't infringe the software's copyright by distributing it, etc...
On the other hand - a company may rightly claim that a device's warrenty is void if its software was altered or changed. For example that is what most, if not all, of the cell operators claim (which is why I mentioned that the situation with the other versions of the Universal may be somewhat different).
Another point is - what the company doesn't know - can not hurt it.
and even more importantly - what you do with your fully paid-up device is up to you, and as long as the ugrade solved your problems, why care?

techDot said:
I doubt that there is any case, for it to be considered illegal.
This is especially true since you are reffering to the Qtek (similarly to the i-mate, but possibly different than other versions of the Universal): your device is similar to any other device (or PC for that matter) that you buy - you may change, alter or add to its software, I guess - as long as you don't infringe the software's copyright by distributing it, etc...
On the other hand - a company may rightly claim that a device's warrenty is void if its software was altered or changed. For example that is what most, if not all, of the cell operators claim (which is why I mentioned that the situation with the other versions of the Universal may be somewhat different).
Another point is - what the company doesn't know - can not hurt it.
and even more importantly - what you do with your fully paid-up device is up to you, and as long as the ugrade solved your problems, why care?
Click to expand...
Click to collapse
Well.... The radio ROM in general 'governs' how the device is acting as a GSM 'client' or 'end-point'. I can imagine quite well that a bug in the radio ROM could cause havoc on a GSM cell if things go wrong, therefor I can very well imagine that at telecoms provider only wants to allow certain tested ROM's for it's device... A GSM phone remains a 2W transmitter, and is in general pre-approved by telecoms due to it being tested and accepted with a specific radio ROM version.

yes, but this should not be an issue with factory ROMs (altering may affect your license to use the network though).
the reason of this spread may be as there are some versions which are more generic (thus quite easily unlocked) than newer ones. this way downgrading is discouraged, not upgrading, in fact.

crusher said:
yes, but this should not be an issue with factory ROMs (altering may affect your license to use the network though).
Click to expand...
Click to collapse
I even doubt this very seriously. I bought my Magician straight from TMO with a 1.01 radio. After 3 months a regular TMO upgrade came along to radio 1.12. As I got my device on a 2 year contract after this period I can get the unlock code for free & put in any sim I like. So who's gonna stop me from using it on other networks then? And what about roaming use? I even could have bought it in a phone shop, same contract, higher price, but ... no simlock at all. Still everything perfectly legal.
Probably they know what can be done & try to discourage any changes with bold statements. To avoid any issues with your warrenty you can always flash it to a standard provider rom, before sending it back.
Maybe the only thing to worry about is a missing sim-lock, don't know whether they check it or keep track of the fact that you might have paid your provider for an unlock code. Mine for instance somehow just 'disappeared' very strange ;-).
Regards, M

Updated 24.11- Galaxy Nexus Volume problem is hardware related...but fixable by soft?

Well, as you can see from the video below, the guy set the highest volume, then place the smartphone near the Galaxy Nexus and the Galaxy Nexus respond to it. This is CLEARLY hardware issues. This could be the real reason Verzion still haven't release the Galaxy Nexus yet.
www.youtube.com/watch?v=BIFRYY25fDo
Thanks dnlsmy.
www.youtube.com/watch?v=y_mO_K7OYR0
Update 1
Google "We are aware of the volume issue and have developed a fix. We will update devices as soon as possible."(and you holding it wrong xDD) jk
Update 2: Lee Johnston explain of "volumegate" issue
Let's talk about the Google Nexus "volumegate" issue.
Today Google said that they have fixed the problem in software, and that a fix is coming.
I see many people saying this is a bunch of BS, but in reality they just have no idea how complex electronic circuits and software interact.
I'm a Systems Engineer and also a Developer. I deal with things like this every day.
What we have here is indeed a hardware issue, in that the radio interference is coming in through the radio hardware.
However things like this can be fix fairly easily in software. It's called debounce.
When you monitor an electronic input like the buttons on a phone there is always noise and flutter even when you just press the button. If testing by Google has shown that they just need to turn up the debounce time (the time which an input must exceed for it to be determined to be a genuine press) then it will more than likely just work and no one will ever see ti again.
Like I said I deal with this kind of thing every day, it's not a big deal as long as your debounce time is not excessive. But noise happens down on the order of 1 to 40 ms, real inputs when you press a button last from 100 or 200ms if you tap the button, up to seconds if you hold it down.
This is nothing like Apple and the iPhone 4 antennae problems that could not be fixed in software. I'm sure everyone will see in due time, the problem will be fixed, and the dust will blow over.
And people will be saying "wow, I was wrong, Google rocks
Cheers,
Lee
Finally, Where is the GSM HSPA+ 32GB version of Galaxy Nexus??????!!!

Yeah, and for further proof, he does it in the bootloader screen of the GNex
http://www.youtube.com/watch?v=y_mO_K7OYR0
This seems like it's a hardware fault entirely.

I wasn't sure what the test was but it looked inconclusive to me. Almost looks random.

TiltedAz said:
I wasn't sure what the test was but it looked inconclusive to me. Almost looks random.
Click to expand...
Click to collapse
He has an incoming call on the other device. When it touches the side of the Galaxy Nexus it causes the volume to erratically go down/up. It just shows that the radios are effecting the volume.
This would fit with people saying its happening when the phone is in 2G networks.

TiltedAz said:
I wasn't sure what the test was but it looked inconclusive to me. Almost looks random.
Click to expand...
Click to collapse
well you're mistaken then. the test is not inconclusive at all.

martonikaj said:
He has an incoming call on the other device. When it touches the side of the Galaxy Nexus it causes the volume to erratically go down/up. It just shows that the radios are effecting the volume.
This would fit with people saying its happening when the phone is in 2G networks.
Click to expand...
Click to collapse
Ok, gotcha.
Still could be software and even if it were hardware a little software patch could resolve it.

TiltedAz said:
Ok, gotcha.
Still could be software and even if it were hardware a little software patch could resolve it.
Click to expand...
Click to collapse
no software patch can fix this. the phone has inadequate RF shielding.

My bionic which I know is a different device does something similar. When I put it next to my corded work phone and the bionic switches to 4g it causes the speaker on my work phone to male a distortion noise even when it is hung up. So I can see where the radios cause some sort of interference on these 4g phones
Sent from my DROID BIONIC using Tapatalk

TiltedAz said:
Ok, gotcha.
Still could be software and even if it were hardware a little software patch could resolve it.
Click to expand...
Click to collapse
Sadly no. The phone was shown to be affected even whilst in the bootloader-- a place unaffected by the OS software and everything that it contains.
Edit: Here is the video of it being affected at the bootloader: http://www.youtube.com/watch?v=y_mO_K7OYR0

Does this affect certain frequencies. It seems like the signals are affected in the US. Only UK signals?
Sent from my SPH-D710 using XDA App

Would that have anything to do with the nfc chip?

DammitCubs said:
Does this affect certain frequencies. It seems like the signals are affected in the US. Only UK signals?
Sent from my SPH-D710 using XDA App
Click to expand...
Click to collapse
please read this post
---------- Post added at 08:24 PM ---------- Previous post was at 08:23 PM ----------
dadsterflip said:
Would that have anything to do with the nfc chip?
Click to expand...
Click to collapse
it has nothing to do with the NFC chip or aerial

I was able to replicate the second video demo by setting the gNexus to 2G only, wifi off and making a call from a HTC Desire a few millimetres away. I appreciate this is an uncommon scenario but others who experience it in daily use so it must be an internal radio that is affecting other parts of the internals.

chandlerweb said:
I was able to replicate the second video demo by setting the gNexus to 2G only, wifi off and making a call from a HTC Desire a few millimetres away. I appreciate this is an uncommon scenario but others who experience it in daily use so it must be an internal radio that is affecting other parts of the internals.
Click to expand...
Click to collapse
yes, exactly - the internal radio on the Galaxy Nexus is causing the problem. that is why those of us who have been affected by this hardware defect have been so vocal about it.

vash1053 said:
Sadly no. The phone was shown to be affected even whilst in the bootloader-- a place unaffected by the OS software and everything that it contains.
Edit: Here is the video of it being affected at the bootloader: http://www.youtube.com/watch?v=y_mO_K7OYR0
Click to expand...
Click to collapse
Does the bootloader also have a linux kernel or is it lower-level than that? If there is a kernel there is a remote possibility the issue is there. A kernel update in the OS also might make it possible to filter out the RF interference by analyzing what's going in (although that's not too likely).
Either way, the phone needs a hardware rev to improve shielding.

This is why I effing hate Samsung they always screw something up... Looks like the g-nex us going to be a big failure.. Hint hint goggle you should of stick with HTC to make your nexus line phones

Danrarbc said:
Does the bootloader also have a linux kernel or is it lower-level than that? If there is a kernel there is a remote possibility the issue is there. A kernel update in the OS also might make it possible to filter out the RF interference by analyzing what's going in (although that's not too likely).
Either way, the phone needs a hardware rev to improve shielding.
Click to expand...
Click to collapse
the bootloader is akin to a BIOS on a computer. it is very low level.
it needs a hardware fix.

oscillik said:
the bootloader is akin to a BIOS on a computer. it is very low level.
it needs a hardware fix.
Click to expand...
Click to collapse
Yeah, figured it was. And trying to work around it by analyzing radio signals to detect if it is a real button press or interference would be very hard too, they're going to have to do something about the phones already sold - this is a huge issue.

This is indeed bad. I guess this makes my decision easier about getting one from Hantec. Hopefully the Verizon version doen't have this issue since it uses different frequencies however, this may be the reason they haven't released it yet.

Nexus exchange?
The fact that Samsung have begun replying to peoples comments on their UK Facebook page asking for an email to be sent to technical support including their home address suggest they intend to replace the phone. It`s a great phone and it should never have happened but it`s how Samsung/Google deal with it.
For those who haven’t read the Facebook comment from Samsung :
Samsung UK Hi *, to ensure we investigate thoroughly could you please send the following details to [email protected]: Serial Number, IMEI number, date of purchase, place of purchase, details of issue
your name, address and phone number. We will get in touch as soon as we have more information.

FMRadio from n7100 or spiritfm?

Has anyone tried to get the FM Radio working via the spiritFM app or simply by copying the proper files from an N7100 firmware?
I've attached the FMRadio.apk from my own deodex'd n7100. It might need other files.. if so, let me know. (You could also just pop over the to international NoteII dev forum and download one of the many CWM installable firmware posts there and pull whichever files needed from the .zip archive.
(The same might even be possible for the multi-view stuff)
Take care
Gary

When I go to install it, it starts to try but then fails and says application not installed.
I do have the setting ticked to allow applications from non-market sources to be installed. I just installed the Amazon app store so I know it's letting me install downloaded apks.

Check the following thread for a free download of spiritFM. Try to configure it as an i9300 (read the related parts of the OP, etc) to get it going.
The idea here is just to see if everything hardware-wise is working for the FM radio. If so, it shouldn't be TOO difficult to get the software parts going.
http://forum.xda-developers.com/showthread.php?t=1059296

Anyone making any progress here? I'm eager to know if the hardware is present on the device. I'm not hopeful though since it wasn't on the GSIII.

Poke_N_PDA said:
I'm not hopeful though since it wasn't on the GSIII.
Click to expand...
Click to collapse
Well, the US variants of the SGS3 were actually a completely different phone than the international variants. With the Note2, the US variants are supposedly identical in hardware to the international N7105. (international Note2 with LTE)
What I don't understand is... why hasn't anyone actually tried spiritFM and posted back their results?

garyd9 said:
Well, the US variants of the SGS3 were actually a completely different phone than the international variants. With the Note2, the US variants are supposedly identical in hardware to the international N7105. (international Note2 with LTE)
What I don't understand is... why hasn't anyone actually tried spiritFM and posted back their results?
Click to expand...
Click to collapse
while the differences are much less than the gs3, I don't think they are the same phone. The main difference is in the radios. we won't know for sure until we start seeing teardowns of the us versions. That said, i totally agree. why hasn't anyone tried this?!?!?! whoever has a T-Mobile note, please do this!!!!!

When i flashed N7100 Rom into my T889 phone, i remember i tried the FM radio App and it didn't work. i open the FmRadio app it asked me to plug my headphones to use it as an antenna and when i plugged in my headphone and try to turn it on it didn't do anything...
so i guess there is hardware difference between N7100 and T899.

You're going to need the lib.so files that drive the apk.
I think that may be all, but it's been so long since I had a phone with a fm radio that wasn't utilized by the stock rom that I can't even remember which phone or was though it may have been the Nexus One. I remember for sure that the original Motorola cliq was able to get the fm radio functional but that wasn't an xda forum. I Reckon if anyone has the extra time that a little searching here at xda would shed light on whether more is needed than the apk and the libs.
I know for sure we need a driver though ; p

still no one giving this a try?

I'll definitely try this when my T-Mobile Note II comes in since I would love to have FM radio. I agree that SGS III shouldn't be proof that this won't work since the hardware this time around in our variants is much closer to the international version. It's very possible the hardware is there and the software is disabling it or not accessing it at all. Would these methods require root access? I'm ok with sideloading apps and dumping library files where they need to go. I'd prefer not to root since that would prevent other things from working like ISIS (I'm from Austin) and getting official updates.

I wanted to bump this and ask if anyone has had any luck with this. I had tried the suggested stuff the thread was started on to no avail.

According to samsung the firmware and hardware are present on the phone. However I believe we are missing the library files for accessing it. If anyone has an international note they can extract them from they should work in theory.
Sent from my SGH-T889

I thought the FM Radio not present on the SGH-T889. Or am I missing something?

There's no FM radio hardware AFAIK, and certainly no software from Samsung for it in all the LTE Note 2 variants. The N7100 has a completely different radio chip than its LTE brethren; Intel vs Qualcomm.
See: http://en.wikipedia.org/wiki/Samsung_Galaxy_Note_II#Communication_processor

Works
Since no one has posted a straight forward answer, yes, I've tried and Spirit FM (free) works on the international version (N7100).

cheenu_sri said:
Since no one has posted a straight forward answer, yes, I've tried and Spirit FM (free) works on the international version (N7100).
Click to expand...
Click to collapse
Well we knew that much... The whole initial question was whether it worked on the T-Mobile USA version. Since it doesn't have it embedded in the chip... It doesn't work. No biggie for me since FM blows anyways. I guess it could come in handy in a no data area or emergency...

sino8r said:
Well we knew that much... The whole initial question was whether it worked on the T-Mobile USA version. Since it doesn't have it embedded in the chip... It doesn't work. No biggie for me since FM blows anyways. I guess it could come in handy in a no data area or emergency...
Click to expand...
Click to collapse
FM is great for local sports

one80oneday said:
FM is great for local sports
Click to expand...
Click to collapse
Touché! That's an excellent point. I've been lucky SiriusXM has been covering most of mine even college. Well that's all we have here in the sticks lol

[Q] DRM Problems with unlocked Bootloader

Hello Together
I was thinking of Unlock Bootloader of the H815 EUR Model with the official Unlocktool from LG, but i have some fears about the DRM, so my Question is: have users who used the official Tool to unlock the Bootloader find some problems with DRM?

spencer92a said:
Hello Together
I was thinking of Unlock Bootloader of the H815 EUR Model with the official Unlocktool from LG, but i have some fears about the DRM, so my Question is: have users who used the official Tool to unlock the Bootloader find some problems with DRM?
Click to expand...
Click to collapse
no problems here

No DRM problems... Deezer and Spotify works perfect.

I would be very interrested to get a definite answer to this from someone who really knows what the unlock removes and what it does to the device. Not just speculation and guesswork. If I knew that the official unlock would not ruin anything I would root my device right away.

What speculation and guesswork?? Mine is rooted.
But if you are that cautious better not to to root at all.

*justintime* said:
What speculation and guesswork?? Mine is rooted.
But if you are that cautious better not to to root at all.
Click to expand...
Click to collapse
Yeah but do you know where the keys are used? They are not there just for the fun of it. If the keys are there there must be some form of function for them. You saying that camera works, Spotify works etc does not say a lot other than the apps you use work. It might be just some minor thing like Google play rented movies not working but I like to know about it. And nope, I am not overly causious. I want my phone to work like its supposed to in all aspects. And I have rooted/customized etc quite a few phones in my years so I know enough not to rush in to things that might not be so straight forward as it seemed at the time.

I agree with the question. The statement of LG redarding the DRM stuff is a bit vague. If someone has and could provide concrete information on what actually is affected by that, that would be awesome. Especially if the camera may be affected negatively like it was on Sony devices ...

Not trying to be an a** but we are telling you that everything worked just as it did before and you don't like that answer. Remember, you are asking users in an internet forum for answers that can only truly and definitively be answered by the OEM. Seems to me like your only choices are:
1) Ask LG directly and hope you get a straight answer
or
2) Do not unlock your device.

Only DRM stuff I use is Spotify, with no issue(s) whatsoever! Unlocked all droids I ever owned, sold them to friends who dont have a clue about these things, everybody happy, never complaints!

Yep, your point is very valid.
Maybe still two explicit questions to you who have done it already:
1. Any changes on the camera (quality) you recognized? (Like on Sonys models in the past)
2. Do you know if OTA updates still work, when officially unlocked?
Regards

hdyim said:
Yep, your point is very valid.
Maybe still two explicit questions to you who have done it already:
1. Any changes on the camera (quality) you recognized? (Like on Sonys models in the past)
2. Do you know if OTA updates still work, when officially unlocked?
Regards
Click to expand...
Click to collapse
Not seen any difference in the camera before or after, in all modes everything works fine (including RAW capture etc.) if anything slightly better as you can then flash the boosted JPG quality cam mod from the forums here.
In terms of OTA updates my phone hasn't picked any up, but I don't know if the UK is supposed to be on version 10C or not. Either way I managed to update it through the Android Dev section of the forum.
AFAIK most phones lose OTA updates if you unlock bootloader and root, but I may be wrong on that count

Bootloader unlock and no DRM problem.
Spotify, Deezer works perfectly
unlock lg officialy on site

List of Apps that Work after BL Unlock
I've a LG G4 H815 Model BL unlocked
This Apps works so far after the Unlock:
-Google Music All Inclusive
-Netflix
-Camera
-Quality is the same as before Unlock
-Playstore
-Buy Music
-Rent or buy a Movie

Encryption anyone?
Did anyone encrypt their device before or after unlocking with the LG unlock tool? Any Problems there?
Any unlocked + encrypted phones out there?
Furthermore I would be interested how many of the geeks around here encrypt their phones?
For me, these days, I do not own a single device (PC, Notebook, Smartphone whatever) that is NOT encrypted. The more easy you loose the device, the more encryption should be a standard.
What is the reality? And does it work with the unlocked bootloader?

Rooting and flashing advantages and disadvantages

Hi,
I am with my STOCK G5 since a year. What to say. I recently switched to Evie Launcher, as it gives me a bit of edge over the stock Launcher3. I am quite disappointed in this phone, as my brother in law's E4 is much more fluid than my phone.
Would you recommend me to switch to a custom ROM? What are the advantages and what are the disadvantages?
What are the risks to brick the G5 ?
Thank you

Advantages
Latest version of android
No bloat pre-installed apps that are bundled with phones
Potentially greater available free internal storage space (depending on how much bloat there was)
More customisation through appearance/themes settings etc
Disadvantages
Will have to return to full stock if wanting to officially upgrade device
Device would need to be wiped before flashing roms
Some apps will not work if rooted (although you can use magisk to hide root but not guaranteed to be successful)
Bugs may be present in custom roms
There is always a chance to of bricking the device - normally this would only be a soft brick (bootloader still accessible)
As long as you don't touch the bootloader then you can always just flash another rom
Read threads fully before you begin

And of course, it voids your warranty, but in my opinion is worth it, custom roms allow for better speed and customisation.

Exanneon said:
And of course, it voids your warranty, but in my opinion is worth it, custom roms allow for better speed and customisation.
Click to expand...
Click to collapse
That depends on the country you live in
In Europe (eec) it doesn't unless it can be proved your modification due to rooting caused the fault
Anything unrelated would still be covered

TheFixItMan said:
That depends on the country you live in
In Europe (eec) it doesn't unless it can be proved your modification due to rooting caused the fault
Anything unrelated would still be covered
Click to expand...
Click to collapse
Wow, really? I live in the UK, does the same apply here?

Exanneon said:
Wow, really? I live in the UK, does the same apply here?
Click to expand...
Click to collapse
Yes - the manufacturer may moan about it & refuse to fix it but the law states they have to prove the fault didn't already exist or is a direct cause of your modification.
Eg
If the volume buttons stop working because of a design flaw that shows a loose connection to the motherboard than this is covered
If the volume buttons stop working because you flashed a custom rom that's buggy then you tried to restore stock & mucked it up & your phone no longer boots than you're not covered
Wear & tear is normally excluded
Basically if it's hardware related you're normally covered
If it's software related & you're rooted you're probably not & that includes phones that no longer have a bootloader due to incorrect flash or upgrading of roms
The wiki entry for this explains
European Union
The Free Software Foundation Europe argues that it is legal to root or flash any device. According to the European Directive 1999/44/CE, replacing the original operating system with another does not void the statutory warranty that covers the hardware of the device for two years unless the seller can prove that the modification caused the defect.[39]
United Kingdom
The law Copyright and Related Rights Regulations 2003 makes circumventing DRM protection measures legal for the purpose of interoperability but not copyright infringement. Rooting may be a form of circumvention covered by that law, but this has not been tested in court.[34][40] Competition laws may also be relevant.[41] See also "European Union" section above.
Click to expand...
Click to collapse
The USA is more complex - looks like its legal to root a phone but not a tablet but you can't root a phone that was made after 2013 if the purpose is to unlock it for use on another carrier lol & it goes on like that. Basically they have ammendments on top of ammendments on top of ammendments which makes it extremely complicated - even providing a rooting tool in America could be illegal as its not defined as being excluded from the copyright act.
Because non of these things have really been tested in court its just one big grey area

TheFixItMan said:
Yes - the manufacturer may moan about it & refuse to fix it but the law states they have to prove the fault didn't already exist or is a direct cause of your modification.
Eg
If the volume buttons stop working because of a design flaw that shows a loose connection to the motherboard than this is covered
If the volume buttons stop working because you flashed a custom rom that's buggy then you tried to restore stock & mucked it up & your phone no longer boots than you're not covered
Wear & tear is normally excluded
Basically if it's hardware related you're normally covered
If it's software related & you're rooted you're probably not & that includes phones that no longer have a bootloader due to incorrect flash or upgrading of roms
The wiki entry for this explains
The USA is more complex - looks like its legal to root a phone but not a tablet but you can't root a phone that was made after 2013 if the purpose is to unlock it for use on another carrier lol & it goes on like that. Basically they have ammendments on top of ammendments on top of ammendments which makes it extremely complicated - even providing a rooting tool in America could be illegal as its not defined as being excluded from the copyright act.
Because non of these things have really been tested in court its just one big grey area
Click to expand...
Click to collapse
I see, well thanks for taking the time for explaining to me anyway ^-^

Exanneon said:
Wow, really? I live in the UK, does the same apply here?
Click to expand...
Click to collapse
This is one of a wide range of areas in which EU membership has been enormously helpful to consumers. Not for much longer though since, in its wisdom, the UK will be turning its back on these protections over the coming 3 years.

thesoupthief said:
This is one of a wide range of areas in which EU membership has been enormously helpful to consumers. Not for much longer though since, in its wisdom, the UK will be turning its back on these protections over the coming 3 years.
Click to expand...
Click to collapse
I for one am glad we are leaving the EU - These rules will still apply as all EU law will be implemented into UK law but of course they can be changed if our government decides to by debating & voting on new laws & it is right that our government that we vote for decides this & not unelected people in Brussels.
But that's enough of politics

TheFixItMan said:
I for one am glad we are leaving the EU - These rules will still apply as all EU law will be implemented into UK law but of course they can be changed if our government decides to by debating & voting on new laws & it is right that our government that we vote for decides this & not unelected people in Brussels.
But that's enough of politics
Click to expand...
Click to collapse
But then again I doubt many would fight for these things, but who knows.

Yes,
I started reading a bit about the different ROMs.
I can see the usual qualcomm fup job: firmare blobs never converted to 64bit, stuff only working on a single configuration and more.
Therefore I found out that the only thing really not working on custom roms is USB tethering (as per LineageOS 15 declaration), but it can be fixed with an external app.
What seems to be working but not completely is: FM Radio (but, please, prove me wrong if I am), Camera (the wrapper should be working, though).
What isn't extremely clear to me if the stock Lenovo ROM feature of OS navigation through fingerprint reader (a feature I reckon would be Oreo Stock) AND always on display (again, wasn't it a new feature of stock Oreo ?!) .
Last but not least, on a parallel thread there's a guy that says ( https://forum.xda-developers.com/showpost.php?p=76406077&postcount=5 ) : if you go from 32bit to 64bit is fine. Going back will brick your device and/or lose your IMEI.
I hope to have summed up all known elements, if I haven't, please, help me.
Regards,
sweetsuicides