GMKtec K6 (AMI Aptio V BIOS) – User password set, Supervisor menu hidden, Secure Boot

[Halo]

Hello everyone,

I have a GMKtec K6 mini PC (Ryzen model). After setting a User password in BIOS, the Supervisor menu completely disappeared. Because of this:
- Secure Boot is disabled and cannot be re-enabled
- User password flag remains active
- Anti-cheat systems (Battlefield 6) block me since Secure Boot is off
- I cannot set apus gfx  shared ram 


I tried:
- Full AFUWIN flash
- CMOS battery removal
- NVRAM reset

None of these worked. The Admin menu is locked by firmware after the User password was set.
I urgently need either:
1. A way to unlock Supervisor menu again, or
2. A rollback/modded BIOS where Supervisor menu is visible.

I put my dump file to the attachments.Advices and opinions are welcome

Thanks in advance!