TWRP (AOSP 12.1) for A21s

This source is WIP but so far it works good enough for everyday use

Bugs

Everything works except for the following:

• ADB Sideload
• Decryption*
• FastbootD
• Haptics*

Vibrator (Haptics) works but I have disabled it for the time being because it causes a nasty touch delay, will enable it back once I solve the issue.

Decryption does not work on this device and if your device is encrypted then TWRP will be unable to view your files. To Decrypt your device, enter the terminal in TWRP and run the multidisabler command

Features

• DTB: Imported KawaKernel A12 DTB
• DTBO: Imported A217MUBU9DVF6 stock recovery DTBO
• Implemented Multidisabler command
• Recovery Kernel: Slim KawaKernel A12

Building

Make tw directory and go into it

mkdir tw; cd tw

Clone A21s device tree to device/samsung/a21s

git clone https://github.com/DozNaka/exynos3830-a21s-twrp.git device/samsung/a21s

Init TWRP AOSP 12.1 manifest repo

repo init --depth=1 -u https://github.com/minimal-manifest-twrp/platform_manifest_twrp_aosp.git -b twrp-12.1

Sync repo and wait

repo sync

Begin building TWRP

export ALLOW_MISSING_DEPENDENCIES=true; . build/envsetup.sh; lunch twrp_a21s-eng; mka recoveryimage

Output will be in tw/out/target/product/a21s/recovery.img

Installation

Requirements: Rooted by flashing AP file via Odin that was patched using Magisk App

To root your device with the patch AP method you do the following:

• Install Bitfrost apk
• Download stock firmware using bitfrost app
• Extract AP from firmware
• Install Magisk
• Open Magisk, press Install and then Select and Patch a File
• Select the AP file you have extracted from stock firmware
• Once finished patching, you will find the patched AP file in Downloads
• Move the patched AP file to your computer
• Flash the patched AP file with Odin

Once you have done this you can proceed with the methods below

Method 1: recovery.img

• If you are on linux then flash recovery.img with heimdall

heimdall flash --RECOVERY recovery.img

OR

• You can the TWRP app to flash the recovery.img

OR

• You can use the dd command to flash recovery.img by placing the recovery.img in /sdcard and running these commands

su

dd if=/sdcard/recovery.img of=/dev/block/by-name/recovery

Method 2: recovery.tar

• Place the tar file in AP on Odin then flash