I started testing Goomba and PocketNES and worked fine as expected.
First GBA ROM I tested was Castlevania Harmony of Dissonance and also worked perfectly.
However, all these failed:
Mother 3 (English translation)
Kingdom Hearts: Chain of Memories
Doom II
All of them gave black screens with flashing random tiles and looping noises, not even getting in-game.
The diagnostic menu shows these errors:
ROM0 test... ERROR: 24
ROM1 test... ERROR: 20
DISK test... ERROR 01
The rest appear in green.
Is it a faulty cart? Or maybe there is a way to wipe/format the flash ROM and try to fix by myself?