I had to upgrade to this version, as I just bought myself a 8GB SDHC (Toshiba, Class 4).
Notaz patched 2.1.2 didn't want to read my SDHC either, so I installed 4.0.0 and 4.1.0, and now it finaly works, or at least seems to. Connecting the GP2X to my PC will show me 7.5GB free space in nautilus...