(Windows)If anyone is having a problem with bios try this.(warning: I am not responsible for any damages to phone or computer you are doing this at your own risk and I do not support piracy.)
1: In the folder that has the "bios" file click "tools" on the tool bar.
2: Click "Folder Options..."
3: Click "View" tab
4: Uncheck "Hide extensions for known file types"
5: Click Apply and then ok.
6: Right click "Bios" and rename it to "gba_bios.bin" after that press enter.
7: (optional) go back to tools>folder options>view>check hide known file extensions>apply>ok.
8: put the "gba_bios" on your phone and try it.