OMEGA EZ FLASH WHITE SCREEN AFTER CLEAN BOOT

Hallo everybody, I use a ez flash omega kingston micro sd 16 gb (fat32 format) on a GBA advance AGS-101.

Since last days I was able to run quite all the games with CLEAN BOOT mode.

Now, when I try to run a game appear a WHITE SCREEN freezed, it happens to all games.

I've tried:

- upgrade/downgrade kernel/firmware, same problem;
- format SD reinstall, change SD, same problem;
- change GBA, same problem.

The games are playable only on WRITE TO NOOR CLEAN mode.

Any suggestion? Thank you.