Booting OneUI 6.1 S21 5G
On Galaxy A145F - Personal use
Bugs: None

1. Prepare things
Get the base, I used XROM by leumaS
Extract super.img from the ROM zip
lpunpack --partition=system super.img
Unpack system (CRB or UKA)
Be able to kang files from stock rom

2. Get and replace these files from stock
/system/system_ext/priv-app/SystemUI
/system/priv-app/KnoxGaurd
/system/priv-app/Routines
/system/saiv
/system/etc/stage_policy.conf
/system/lib64/libsamsungpowersound.so
/system/lib/ & /system/lib64/
libSoundAlive_VSP_ver316c_ARMCpp.so
lib_SoundAlive_AlbumArt_ver105.so
lib_SoundAlive_SRC192_ver205a.so
lib_SoundAlive_SRC384_ver320.so
lib_SoundAlive_play_plus_ver400.so
lib_SoundBooster_ver1100.so
lib_soundaliveresampler.so
libsamsungSoundbooster_plus_legacy.so

3. From here, replace these over your ones
BiometricSetting in /system/priv-app/
camera-feature.xml in /system/etc/
TouchWizHome_2017 in /system/priv-app/

4. Set props
/system/build.prop:
ro.build.flavor=a14nsxx-user
/system/etc/floating_feature.xml:
AUDIO_SUPPORT_DUAL_SPEAKER FALSE
CONFIG_DEX_MODE (ADD) standalone

5. Finish up
Nuke stuff u dislike like SetupWizard
Repack system raw (keep 200mb free)
Flash system image (DSU or TWRP)