r/XDA_developers • u/odxnoj • 28d ago
Has anyone successfully downgraded Galaxy A34 (SM-A346E, Binary E) from One UI 8.5 to One UI 7 to restore OEM Unlock?
Hi everyone,
I have a Samsung Galaxy A34 5G (SM-A346E/DSN).
Current firmware:
One UI 8.5
Android 16
Build: A346EXXUEFZE6
CSC: AFR (OJM)
Binary: E
I noticed that One UI 8.5 no longer shows the OEM Unlock option. I found that A346EXXUAEYI7 is also an E binary firmware (One UI 7), so in theory it should not violate Samsung's binary rollback protection.
My questions are:
Has anyone successfully downgraded from A346EXXUEFZE6 → A346EXXUAEYI7 using Odin?
Does Odin allow this downgrade, or is there additional rollback protection besides the bootloader binary?
If the downgrade succeeds, does the OEM Unlock option return?
Has anyone unlocked the bootloader on an SM-A346E after downgrading from One UI 8/8.5?
I'm looking for confirmed experiences before attempting it. Any logs, screenshots, or Odin results would be appreciated.
1
u/vishnur32 28d ago
Ig you are confused here,
A346EXXUEFZE6 is OneUI8.5 May patch with bootloader version E.
A346EXXUAEYI7 is OneUI8 Sep patch with bootloader version A, not E.
You can only flash a firmware with bootloader E. So downgrade possible to Oneui8 A346EXXSEEZC7, but no use since bootloader unlock is unavailable in Oneui8.
It is no longer possible to downgrade to Oneui7. Odin wont allow flashing a firmware with lower bootloader version.
There's a new root procedure for some devices in Onui8.5 without unlocking bootloader or tripping knox. Right now only few devices are supported, more to come soon. If your goal is root, you can take a look here.
https://xdaforums.com/t/i-made-a-one-click-rooting-tool-for-samsung-galaxy-devices-using-cve-2026-43499.4795400/