I took a risk and downgraded back to 2.0.0 from 4.0.0 then went up to 2.1.1 then 2.1.2, luckily all seems fine.
I used the easy skin installer:
http://www.gp2x.de/cgi-bin/cfiles.cgi?0,0,0,0,68,1905
However the skins aren't appearing in the system menu any ideas?
When I browse to the NAND it's...