Device Tree for the Samsung Galaxy S21 FE 5G (SM-G990B Snapdragon)

You will need to get the TWRP Minimal Manifest files

How-to compile:

export ALLOW_MISSING_DEPENDENCIES=true
. build/envsetup.sh
lunch twrp_r9q-eng
mka recoveryimage

Install

Flash latest release in AP Slot && vbmeta-disabled in Home Slot with odin
Reboot directly into recovery (Power + Volume Uo)
Terminal -> type "multidisabler"
Format data, cache
enjoy

Bugs

Tell me

Useful commands:

Boot into recovery
Connect the device to your pc
open terminal
adb shell
multidisabler
twrp format data
twrp wipe data
twrp wipe cache
twrp wipe dalvik
adb push /path/to/file /data
twrp install /data/file.zip

notes to install gsi

start into twrp recovery
adb reboot fastboot
fastboot flash system /path/to/system.img

Thanks to Afaneh for his work