Unfortunately a lot of the GP32 websites and forums, including gp32x.com, are long gone and I haven't had time to dig into the way back machine to see what has been saved. I'll add anything I find when I can. It has also been a really long time since the glorious days of the GP32 and I have forgotten a lot of what I did know. I was not a particularly productive or knowledgeable member of the community and my coding skills were nill back then. It's a testement to how helpful and patient the coders in the GP32 community were that I managed to make anything for it at all! ..that sounds familiar :)
|GP32 section of the Pyra website
Run by EvilDragon, who was a mod at gp32x and is now producing the Pandora and Pyra open handheld systems.
|GP32 File Archive
A backup of Hando's file archive, originally attached to gp32x.com, I think, also maintained by EvilDragon.
Thankfully archived, the GP32 JTAG instructions and source code from Rob at Cobbleware.com.
|GP32 repairing thread on pyra-handheld.com
This thread contains all the information needed for fixing a bios corrupted GP32.