Hey don't give up lubidog, it's not that bad!
Just go to:
http://archive.gp2x.de/cgi-bin/cfiles.cgi?0,0,0,0,42,914
and click on download to get the firmware file gp2xfx100-101.zip
If you are unfamiliar with .zip files go and get a utility such as Winzip
http://www.winzip.com/
and extract...