I can't upgrade cos i already flashed the firmware with the official 1.33 from
www.pioneer-eur.com and you can't overwrite it with the patched version which i'm pissed about. 'NO' you can't downgrade once you have upgraded. I believe 'Dust' mentioned something about a patch or something to downgrade that's floating around on the net.
Have a look at this..
http://sccs.d2g.com/
Me personally, i wouln't do it unless your experienced in doing this sort of thing