G4 Bootloader Relock? - G4 Q&A, Help & Troubleshooting

Hi all, I need to relock the bootloader, flashing back stock MM or LP didn't solve the issue for me, neither hard resetting, bootloader is still unlocked and the message appears on every start in the high left corner.
Can You help relock or it's impossible for now please?

It's not possible to relock once it's unlocked. It does tell you this when u unlock it.
Sent from my LG-H815 using Tapatalk

awes0me1 said:
It's not possible to relock once it's unlocked. It does tell you this when u unlock it.
Sent from my LG-H815 using Tapatalk
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thanks for the answer, I did not remember that message. Strange for me that noone found or searched a method to relock for selling the phone :good:

Getting it relocked is the only way to send it back for warranty claim. I wasn't able to get it recognized by my computer so that I can run fastboot comands on it - the right one is ./fastboot oem lock

maildaemon said:
Getting it relocked is the only way to send it back for warranty claim. I wasn't able to get it recognized by my computer so that I can run fastboot comands on it - the right one is ./fastboot oem lock
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Did you use the proper fastboot.exe? What OS is your computer? If it's windows try these.

It seems that in order to get fastboot operational, you need to have a working bootloader. So, after a couple (hundred) of tries - DO NOT FLASH KDZ (REFURBISH) your LG G4, it still boots once in a while and if it has your account and data and it will be faster to get to fastboot mode and get the bootloader locked again. Can somebody confirm that you can execute "fastboot oem lock" on an unlocked device? This will save us a lot of time trying to get the device to that state...

for me it is impossibile. If you have a g4 with bootloader locked and you doing fastboot oem unlock it says that it is no possibile...you must follow the instructions that lg provides with file unlock.bin
So is impossibile relock bootloader with fastboot oem lock...I hope that anyone find the way to do it...

Well unfortunately it is not posible to lock the bootloader via "fastboot oem lock" I'm waiting for user @warloxfre for some more info on his ideas (fingerscrossed)

Related

[Q] unlock bootloader logo

I will receive my galaxy nexus few hours later and plan to unlock my phone. Is there a way to hide the unlock logo after I unlock the bootloader or Can I unlock the bootloader, then root the phone and relock the bootloader after to clear the logo but still get the root access. If yes, then how to relock the bootloader?
fastboot oem lock will re-lock the bootloader
But will I still get the root access of my phone after I relock the bootloader and will the unlock logo disappear when boot up after I relock the bootloader?
p.s. It is retail version
why do you need it locked?
I don't like the unlock logo at bootup and the warranty detail only state that I will lost the warranty if I unlock the bootloader, so relock it in case I need warranty, it may cheat them
so then you relock it if you need to. Development for this phone is very young right now so you'll likely be doing alot of flashing. I flash different rom/kernel combinations probably 3-5 times a day with how often things are updating right now. Besides the little unlock symbol is pretty awesome
I know the development is young, that's why I post this. I just need to confirm
1) Is it possible to relock the bootloader in retail version
2) Will the unlock logo disappear after relock
3) Will the phone can still get the root access after relock the bootloader
Thx very much and please reply me if anyone know!!
punalex said:
I know the development is young, that's why I post this. I just need to confirm
1) Is it possible to relock the bootloader in retail version
2) Will the unlock logo disappear after relock
3) Will the phone can still get the root access after relock the bootloader
Thx very much and please reply me if anyone know!!
Click to expand...
Click to collapse
1) Yes, "fastboot oem lock"
2) Yes
3) Yes, while "fastboot oem lock" does not touch any of your data, "fastboot oem unlock WILL delete all your data. None of these processes can remove root access, the only way to remove it is to reflash the system partition, either by flashing it manually or through an OTA update.
Thx Thx Thx Thx very much

How can I lock my bootloader?

Is it possible to completely lock my my bootloader after unlocking it?
I used fastboot oem lock and now it says RELOCKED in fastboot. I also got rid of the security warning flag. Next I'd like to get a complete lock so I enter fastboot oem writesecureflag 3 which hangs the bootloader and doesn't fix my problem. has anyone yet been able to obtain complete LOCK?
CrisisCorE said:
Is it possible to completely lock my my bootloader after unlocking it?
I used fastboot oem lock and now it says RELOCKED in fastboot. I also got rid of the security warning flag. Next I'd like to get a complete lock so I enter fastboot oem writesecureflag 3 which hangs the bootloader and doesn't fix my problem. has anyone yet been able to obtain complete LOCK?
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Complete lock is NOT possible. That's the way it is.
not possible yet mate
Hmm shame, Thanks though.

Your device is corrupt. It can't be trusted and will not boot

Hi friends
Please give me suggestion or guide how to solve problem about handset booting after mistakenly handset OEM locked through fastboot
It enter to fastboot mode but not going to recovery mode or restart in system mode
Is there any solution
If yes then please help me
fastboot oem unlock ?
Actually ive unlocked OEM and install twrp recovery and installed freedom os
Then while checking OEM status ive enter command fastboot OEM lock
It ask me I've pressed yes after that the massage is came after restart as your device is corrupt it can't be trusted and will not boot
After that it enter to fastboot but not going to recovery mode or system
While type command in fastboot OEM unlock massege come failed
This happens because your bootloader has been unlocked at one time. There is no going back, even if you use "fastboot oem lock" later.
Edit: Just noticed the part about your device will not boot. You need to find the system image and flash it. I read somewhere today that OnePlus just released the system image for 4.7.4.
Can you unlock again?
@op, IMHO the best possible solution will be to flash stock rom image and stock recovery if required but I think when you flash stock image it will also flash stock recovery.
When you turn off the phone and boot it with VOLUME UP plus POWER, this should send you straight away to Fastboot. Try if you can unlock again, otherwise... bad luck - you'll need a restore session with 1+.
the Doctor said:
This happens because your bootloader has been unlocked at one time. There is no going back, even if you use "fastboot oem lock" later.
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Not to be unrespectful, but you're wrong, it is absolutely possible to relock bootloader without problems.
IMHO, trouble happened because he had a custom rom onboard... and a locked bootloader does exactly its purpose... to not boot insecure firmware!
jonsat said:
Not to be unrespectful, but you're wrong, it is absolutely possible to relock bootloader without problems.
IMHO, trouble happened because he had a custom rom onboard... and a locked bootloader does exactly its purpose... to not boot insecure firmware!
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Click to collapse
After looking into it further, I agree with you. That's what I get for having a bootloader-locked Samsung device for two years. I must be getting rusty!
Yes, the bootloader can be re-locked. There may still be a tamper flag as with previous OnePlus devices. But having a locked bootloader with non-OEM software would likely cause the problem he is describing. So, he needs to flash the factory image from bootloader.
I've requested to 1+support for restore remote session
Support send me file link and l2 will assist me in within 2 days
DO NOT RELOCK BOOTLOADER UNLESS U READ UP FIRST!!!!!, its worth just waiting the few seconds after reboot, then to go and try to relock the bootloader
I've restored oneplus 5t through remote session
it become as company new mobile
After that OEM also unlock
Thanks oneplus supports.
kaihansen2001 said:
Can you unlock again?
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Yes ive unlock Bootloader
Rdxsammm said:
I've restored oneplus 5t through remote session
it become as company new mobile
After that OEM also unlock
Thanks oneplus supports.
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Click to collapse
How did you do it? can you guide me too?
sam razzy said:
How did you do it? can you guide me too?
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Have you dumpling files and MSM download tools for oneplus 5t
If you have then restore op5t after success it work as new mobile.
But you can get basic dumpling file from oneplus support remote session.
You have to create ticket and chat with oneplus support
oneplus 5 device corrupt and it cant be trusted and will not bootr
hrushi0130 said:
oneplus 5 device corrupt and it cant be trusted and will not bootr
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Click to collapse
Did you by any chance re-lock the bootloader with a custom recovery and custom ROM flashed?
It's because of custom recovery.
Just flash stock recovery image before locking the bootloader.
This fixed for me.
Rdxsammm said:
Actually ive unlocked OEM and install twrp recovery and installed freedom os
Then while checking OEM status ive enter command fastboot OEM lock
It ask me I've pressed yes after that the massage is came after restart as your device is corrupt it can't be trusted and will not boot
After that it enter to fastboot but not going to recovery mode or system
While type command in fastboot OEM unlock massege come failed
Click to expand...
Click to collapse
You unlocked bootloader, flashed rom (custom) and relocked bootloader? Never lock your bootloader on a custom rom! Just enter fastboot again flash twrp (manual/force reboot recovery), copy internal storage to pc then wipe/format everything. Format data. Factory reset then flash latest official rom and reboot

How to Lock Bootloader?

Solution to Lock Bootloader:- Go to Fastboot Mode,
Type :
fastboot oem relock (Bootloader unlock code without bracket)
I finally submitted my device to service centre
Needed a help in locking bootloader of Honor 8 Pro Indian Variant DUK- L09 C675.
I flashed Latest Oreo update through TWRP with the help of DUK_FullOTA_ROM_flasher method but the bootloader is still unlocked....
If anyone could help me with this as I have to visit service centre related to mic issue.
Connect to your computer, restart to fastboot mode and use "fastboot oem lock". Make sure you have a stock recovery and ROM on it, because the locked bootloader will not boot anything else.
aserraric said:
Connect to your computer, restart to fastboot mode and use "fastboot oem lock". Make sure you have a stock recovery and ROM on it, because the locked bootloader will not boot anything else.
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Relocking bootloader by this method will erase all data?
arunpkrt said:
Relocking bootloader by this method will erase all data?
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Click to collapse
No, it won't. But you should still have a backup whenever you mess with fastboot.

Corrupt OS

So I have tried everything to salvage this phone. The bootloader is locked and there is no way to get into the OS. I have tried the fastboot unlock and unlock_critical commands also tried to do the Set active from b to a but the command is not allowed due to the bootloader being locked. I have a feeling that I am just screwed. I can get into the bootloader but that's all I can do. If anyone has another Idea that I have not tried that would be great.
weaselskhs said:
So I have tried everything to salvage this phone. The bootloader is locked and there is no way to get into the OS. I have tried the fastboot unlock and unlock_critical commands also tried to do the Set active from b to a but the command is not allowed due to the bootloader being locked. I have a feeling that I am just screwed. I can get into the bootloader but that's all I can do. If anyone has another Idea that I have not tried that would be great.
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Can you get into recovery at all? If not contact Google see if they'll RMA usually they are good with that and will just replace your device asap
Ok so new twist I was just playing with fastboot commands and typed in fastboot continue and the phone booted up. How weird is that.

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