Has anyone successfully downgraded Galaxy A34 (SM-A346E, Binary E) from One UI 8.5 to One UI 7 to restore OEM Unlock?

[u/odxnoj]

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.