The anwer is simple - with certin games with black or white screen problems
Open any game that work's with no$gba - edit no$gba settings to boot from GBA BIOS (nintendo logo) and save setting - close down program
Open no$zommer.ini file - edit UseCrypt=0 to UseCrypt=1 , save the file about twice don't know why just works that way - if you have a crash just open the file again and save it again !
run your game with no$zommer again - and it will look like a real cartrage icon - click on it - and your game should run fine!
Yes - you do need all bioses and firmware.bin in the same folder as your emulator