Hi Force-x,
If you tried to just use the update process, that does not work of course. You need a serial cable and copy the dump as described in the following thread:
[K3]+[DXG] Un-demo information
You can find the 3.2.1 version in a torrent (just google it), however that is the unofficial updated hybrid (with K3) version that has a couple defects (slow wake up time and noise in mp3s).
If there is somebody willing to dump his 2.5.8 version (please PM it to me as well!) that is actually quite simple, just jailbreak (if not already done) and use the program from stangri which is actually in the same thread as the already linked
Dump DX.
Good luck,
TommyTomTom