Jeremiah Bess has released a Pixel Fixer for the GP2X, heres the details:
This should fix a stuck pixel. This has been untested on a stuck pixel, so comments are appreciated. This runs as an endless loop, so use fresh batteries.
REQUIRES python and pygame installed and functional.
Download Here --> http://www.gp2x.de/cgi-bin/cfiles.cgi?0,0,0,0,8,1994