[Samsung Galaxy A12] System23:
Ya can Downgrade your Samsung devices (all samsung) but the Reason is Ya must Stay on the Same binary ya have Installed so you have Binary 2 you can Flash all Binary 2 Firmware , when ya on Binary 3 you can only Flash Binary 3 Firmware on SM-A125F Binary 3 that are A125FXXS3CWF3,A125FXXS3CWF2,A125FXXS3CWF1,A125FXXS3CWE1 these you can Flash without any Problems!!! when ya would Downgrade Binary 3 to 2 Odin,Heimdall,etc Stops and the Device shows Fused 3 and xxxx is Binary 2, the Only One Option to Flash a lower Binary Firmware without any Notification is in BROM Mode with MTKclient you can even Flash the Preloader with that, but the Problem after the Succesfully Flash is your Device dont Reactivate from BROM Mode even ya use the END BROM,Restart,SPflash-method,remove Akku or try Button Combo nothing bring Ya Back to Normal Start Device!!!

And that so long you Stay on Flashed Firmware!!!!

So your only Option is than to Flash one of the Binary 3 Firmware and the Preloader than Ya can se the Device Awakes automaticly after Flash Finished and leave the BROM Mode!!!

SO MY QUESTION IS WHERE IS THE "BINARY" ARE SAVED THAT IT CAN DETECT IT ; WHEN YA FLASH ALL PARTITIONS!!!!WHEN WE KNOW THIS SECRET WE CAN FIND A OPTION TO DOWNGRADE WHEN IT POSSIBLE THAT WE CAN FLASH THE COMPLETE DEVICE AND REWRITE IT NEW, THAN THEORETICLY WE CAN FLASH A LOWER BINARY OF THE CHOISE,AND CAN MANIPULATE ALL SETTINGS iam Think and believe a FlashBOX can do this!!! BUT IAM MUST SEARCH FOR INFORMATIONS BEFORE IAM BUY ONE TO TEST IT!!!!!

And for Ya work on Recovery iam have Updated from

A125FXXS2CVK2 to A125FXXS3CWF3 also Binary 2 to 3!!!!

On Binary 2 TWRP was working Fine

After Update to Binary 3 TWRP and ROOT endet in Bootloop!!!

The Informations to the Update says the Security was Improved, so you must find the Details what was changed than ya can begin with your work on TWRP for Binary 3!!!

So what can we now Say what is Fakt!!

TWRP/ROOT Ended in Bootloop after Flashing , equal witch Method you use

-After Flashing TWRP the Button Combo to start into it , is not longer working

-Flash Ya the STOCK Recovery all is working Fine

-Flash Ya TWRP via ADB Shell in System with root rights and dd if=xxx of=xxx and reboot Device via adb Command adb reboot recovery, the Device starts but not in Recovery-Mode and Ends in Bootloop

-Other users have made LOGS in STOCK and in CUSTOM they Say that they cant Find a difference in LOGed Activity, but they say they not the Experts but have done something!!!

-Magisk Developer say to all is Fine with ROOT, but ends in Bootloop

-SO where is the Detection thats verify STOCK and SET on CUSTOM the Settings to Disable the Button Combo, i have READ that this Option where Enabled when Flash TWRP!!!!

-Where is The verify stored? when Ya can Wipe the Hole Device and its not Touched

-can we Modify this Section we can Do Anything

-IS it Possible or Makeable with a FlashBox

-Other Users mean the Device starts with TWRP/ROOT to this Point whos Load the System in this Section must be Found the Problem that the Device Reboots!!!

-GSI with Rebuild Super.img can Flashed with Odin Patched even they give a Fused 3 super.img Binary 0 Error on Device!!! and the GSI works Fine after that so long the BOOT/RECOVERY are on STOCK!!!

What Think you about this Description of my research in Internet simple by googleing different Questions and read many many POSTs about it!!!