Flash stock rom, downgrade and root - Samsung Galaxy S9 Questions & Answers

Hi, first time posting here. If doing it wrong sorry.
Rooted my s9+, flashed soldier rom. All ok.
Want to go back and use stock UK H3G rom [downloaded from sammobile] (to use substratum themes).
Backuped EFS
If i flash stock rom (from 9.0 to 8.0) using odin will I be able to root without waiting for bootloader to unlock and downgrading wont be a issue?
Hope you can help me with that.
Thanks!

Related

[Q] Downgrade from Custom 4.4.2 to stock 4.3 possible?

Hi everyone I hope this is not a repetition of some old thread (I tried but couldn't find though).
I was using my note 2 (T889) on stock 4.3 which i previously flashed via odine. A couple of days ago i came by this good looking kitkat based rom ( eZKAT v2.0 ) and went on to try it. the rom flashed flawlessly and after flashing my modem i got the signals as well but the wifi was not working. tried using dr. ketans wifi patch but didnt get the wifi to working. Anyhow, I decided to go back to 4.3 via odine. The odine flashing completed successfully but i got stuck on T-mobiles boot screen for hours.
Is there anything called "you cant go back to 4.3 from 4.4.2"? If yes, then whats the way around? I really need to go back to the stock.
Thanks.
zetrixNoob said:
Hi everyone I hope this is not a repetition of some old thread (I tried but couldn't find though).
I was using my note 2 (T889) on stock 4.3 which i previously flashed via odine. A couple of days ago i came by this good looking kitkat based rom ( eZKAT v2.0 ) and went on to try it. the rom flashed flawlessly and after flashing my modem i got the signals as well but the wifi was not working. tried using dr. ketans wifi patch but didnt get the wifi to working. Anyhow, I decided to go back to 4.3 via odine. The odine flashing completed successfully but i got stuck on T-mobiles boot screen for hours.
Is there anything called "you cant go back to 4.3 from 4.4.2"? If yes, then whats the way around? I really need to go back to the stock.
Thanks.
Click to expand...
Click to collapse
I had this problem on my Note also. Downgrading versions of Android requires a data wipe. You will need to reflash your 4.4 ROM then backup your data if you want. Save your backup to your computer then install the 4.3 image.
Sent from my Nexus 7
EverDawn4 said:
I had this problem on my Note also. Downgrading versions of Android requires a data wipe. You will need to reflash your 4.4 ROM then backup your data if you want. Save your backup to your computer then install the 4.3 image.
Sent from my Nexus 7
Click to expand...
Click to collapse
I already tried that but still the booting stuck on the t-mobile logo. I read somewhere that locked bootloader don't let you downgrade to previous version. Is this true?
In that case. Try finding a 4.3 rom that's close to stock.
Sent from my Nexus 7
The locked bootloader is always in stock firmwares i.e 4.3 for the Note 2 but not in custom roms meaning u can even install Lollipop custom on it & downgrade smoothly, i have done that many times. The problem is 4.3 stock firmware has locked bootloader hence downgrading still keeps u in 4.3 bootloader even if u remove all the KNOX files.
Stuck trying to downgrade from custom 5.1.1 to stock 4.3
Hi, i have a problem like this, upgrade to a custom 5.1.1 and then sell the phone, the new owner wants to have it stock, i try to downgrade to 4.3 but i cant, in odin i set the phone to flash it but seems like it doesn`t recognize the phone and i dont know why, so, i decided to try in recovery mode installing from the sd card but the sistem abort, so, i don`t know what to do, i`ll appreciates any help, sorry for my english, i do my best. (i have root access before upgrated to 5.1.1).

From stock 5.0 to a custom rom ?

Hello guys, i was wondering since I've made the 5.0 update (european) if it was possible for me to flash a custom rom like cyanogen without root (because root isn't an option since llp) ?
Valent1 said:
Hello guys, i was wondering since I've made the 5.0 update (european) if it was possible for me to flash a custom rom like cyanogen without root (because root isn't an option since llp) ?
Click to expand...
Click to collapse
After flashing a ROM, flash SuperSu 2.4 to get root.
Sent from my Nexus 7 using XDA Free mobile app
But how do I flash without root ?
It's noobish question, i can't get to recovery, I've tried with the Power and vol down keys, all i can get is a menu to erase my data, thats it.
Firsh backup your data. Then go back to EU stock ROM:
here are the stock ROMs: http://storagecow.eu/index.php?dir=Xda%2FLG+G3%2FStock%2F
how to go back to your stock ROM: http://forum.xda-developers.com/showthread.php?t=2797190
Now you can root your LG G3, use TWRP/CWM custom recovery and flash custom ROM.
Root: http://forum.xda-developers.com/lg-g3/development/root-root-lg-g3-easily-purpledrake-lite-t2821000
TWRP: http://forum.xda-developers.com/lg-g3/orig-development/recovery-twrp-touch-recovery-2-8-2-0-t2966129
Thank you, I hoped there was another way, i will downgrade then, thanks.
maybe there is. Im not pro neither I received OTA for 5.0, but I wanted to have my LG rooted, so I had to downgrade and now I am running AN HD.

How to switch ROM? From Lollipop back to stock, help!

I am running stock right now (JB 4.2.2) and I am planning to flash a Lollipop ROM (AICP 10). If I create a backup (for my stock ROM) at TWRP and did the needed measures to flash the Lollipop ROM and was successful however I want to return to stock ROM. Do I just have to factory reset and restore my stock ROM backup to have a stock ROM again? Sorry for this noob question.
Heeeeelp!
Any idea if that would work?
Just use odin to flash any stock rom
So backup-ing in TWRP before I flash Lollipop from my current rom [Stock JB 4.2.2] is useless?
You can also use your backup from TWRP.
But It will then show that it has been modified, could be a problem with the warranty.
If you want to go back completely for warranty then odin is the way to go
Thank you! I actually don't care about warranty since mine is overdue already. All I wanted to know was if I will be able to go back to JB 4.2.2 with that backup in case I have problems with Lollipop.

Question

Tired of waiting for the MM OTA, I decided to convert my HTC M8 to developer edition.
I've already unlock/root/custom recovery and i got stuck at the s-off. I found out that i need to pay for that and I decided to stop my journey.
Now I'm thinking of flashing a 6.0 MM custom rom based. My question is : What should I do before I flash any custom ROM?
I'm thinking to go back to stock soon and I don't want to mess it up forgeting something.
You need an unlocked bootloader
You need latest lollipop firmware at least when there is no MM firmware yet for your device version - it is a 4.xx.xxx.x firmware
You need to install TWRP 2.8.7.0
You need to install custom ROM (either lollipop or MM base)
Thanks but I think you misunderstand me.
My HTC is already prepared to flash custom rom. I was wondering if i need something to do before i flash my first custom. Something that will help me to go back to stock when i need it.
Make a non-rooted nandroid of your stock ROM. You need it to revert to stock for future OTA or simply back to stock reason.
If you not yet done it, seems it is too late for you because you already root your stock ROM as stated on post #1.
Check my thread link in my signature to see whether there is one non-rooted backup for you.
Yeah, I've already root it
But I found this http://forum.xda-developers.com/showthread.php?t=2265618.
I think maybe this will help me .
Your thread help me too.
Thanks
Err... that link is for M7 ... don't know whether that helps.

Help please for a noob question.

Hello all developers, I have a noob question, please guide. I have ZenFone 2 running on stock android 5.0 and it is rooted. Now I have to flash custom roms and mods but also want to update stock Rom to android 6.0 whenever ASUS provide updates. So I have a simple idea as below -
1) Install flashify app.
2) Take backup of stock recovery.
3) Flash CWM.
4) Take nandroid backup.
5) Now I can flash custom roms.
6) When ASUS provide updates, flash nandroid backup.
7) Flash stock recovery through Flashify.
8) Full unroot from supersu.
Thus my phone will be fully stock and I can update stock Rom to android 6.0 .
Will this trick work; please tell. I am eagerly waiting for your replies.
[emoji4] Thank you [emoji4]
you have to unlock bootloader if you want to flash custom rom !!!
if you unlock bootloader with official tools. you cant receive any update from asus with OTA. but you can flash full stock rom with twrp via sideload or edit stock rom zip then install with twrp.
somebody can unlock bootloader without official tools (i dont try) and they can update OTA
srr my english
VinzNguyen said:
you have to unlock bootloader if you want to flash custom rom !!!
if you unlock bootloader with official tools. you cant receive any update from asus with OTA. but you can flash full stock rom with twrp via sideload or edit stock rom zip then install with twrp.
somebody can unlock bootloader without official tools (i dont try) and they can update OTA
srr my english
Click to expand...
Click to collapse
Thank you very much for the information. Btw, can I make changes to stock Rom without unlocking bootloader and revert back to fully stock phone when OTA comes with the above method ?
Sanesh Munde said:
Thank you very much for the information. Btw, can I make changes to stock Rom without unlocking bootloader and revert back to fully stock phone when OTA comes with the above method ?
Click to expand...
Click to collapse
just root and xposed. but you can receive OTA until unroot and delete xposed (if you know how to)

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