[Samsung Galaxy A12] LAST_krypton:
DISCLAIMER: I WAS NEVER, HAVE NEVER BEEN, AND WILL NEVER BE RESPONSIBLE OF ANY DAMAGES AGAINST YOUR DEVICES BY YOUR OWN MIS-OPERATIONS

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# knox_bit_warranty:0x1
#
# Your warranty is now void
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# You have been warned.
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# I will laught at you if you point the finger at me.

Hello everyone, in this guide i'll be showing you how to install TWRP with Andy Yan's LinageOS, or any other ROM you want.

Make sure to follow this guide if you haven't allready unlocked the bootloader and rooted your phone

https://xdaforums.com/t/unlocking-the-bootloader-rooting-and-installing-twrp.4331859/

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INSTALLING TWRP​

# Make sure you are on android 11 and that you have followed the guide mentioned for unlocking the bootloader and rooting

1. Go in settings app

2. Go in to developer options (they should already be enbled if you folowed the guide mentioned)

3. Enable usb debuging if they aren't allready

4. Reboot to download mode, you can do it with the HW keys or send it from the Android Debuging Bridge (ADB)

For the HW key method power off the phone and conect it to the PC, then hold VOL UP and VOL DOWN at the same time. After that you should get two options, you want the first one which is just press VOL UP.

For the ADB method, install the most up to date SDK platform-tools version and open CMD or TERMINAl in the install folder and type adb reboot download.

A usb debuging request should pop up on the phone, you want to click allow, and it should reboot in to download mode.

5. Open odin, click on AP or PDA and select the twrp file you have downloaded and uncheck auto reboot in options then you can click start

6. After the flashing process hold VOL DOWN and POWER at the same time and immediately after the phone exits the download mode hold VOL UP and POWER at the same time

7. If you failed to boot in to TWRP the instalation process will have to be repeated again.

INSTALING LINAGEOS OR ANY OTHER CUSTOM ROM​

Download a AB rom, TREBLE CHECK is wrong.

# You will need an a external Sd_card if you are doing the method 1

Method 1.​

1. Transfer the linageos .img file you have downloaded to your sd_card.

2. Boot in to TWRP, VOL UP + POWER while booting or adb reboot recovery.

3. Once in TWRP select wipe, click advanced wipe and select data, system, internal storage, cache, dalvik, optional(efs, and thoes other stuff, not going to name them.)

4. After successful wipeing go in to install and select storage, click Micro Sd card and click ok.

5. Click install image and find your LinageOs.img file and select it.

6. Now you should be in a install image screen, select System Image and swipe to FLASH.

7. Reboot and enoy.

Method 2.​

1. Boot in to TWRP and go in to WIPE, selcect advanced wipe and check data, system, internal storage, cache, dalvik, optional(efs, and thoes other stuff, not going to name them.)

2. Go in to advanced options and select ADB sideload.

3. From the TERMINAL or CMD window type "adb devices" to check if your device is beeing recognized.

4. If the conections is confirmed type "adb sideload LineageOS.zip"

5. After flashing reboot and enoy.

If by any chance you get issues with flashing roms in TWRP because of problems with dynamic partitions flash DynaPatch to allow flashing to dynamic_partitions in recovery, you don't necesery need to use DynaPatch. You can use unviresal system rv disable enable, etc and etc. This is a problem in TWRP it self which soon should be fixed.

Another thing is if you rooted your phone the way in my guide, the patched boot_image might still stick to the new rom.

Knowng bugs:

LinageOs screen touch stop after putting the phone to sleep.

https://xdaforums.com/t/unlocking-the-bootloader-rooting-and-installing-twrp.4331859/

SDK Platform Tools release notes | Android Studio | Android Developers

Android SDK Platform-Tools is a component for the Android SDK.

developer.android.com

https://xdaforums.com/t/gsi-11-lineageos-18-x-gsi-all-archs.4205461/

https://xdaforums.com/t/aosp-11-unofficial-samsung-sm-a125f-twrp.4317131/

Credits

@edward0181 twrp

@AndyYan LinageOs