Can you get out of the bootloader screen and go back to windows mobile?
If you can't, try HTC HD Mini ROMS, that is the only Winmo device that has the same resolution, and similiar specs, if you can go back to windows mobile, don't try unless you have everything backed up and can boot back to 6.5 if anything goes wrong,
http://forum.xda-developers.com/forumdisplay.php?f=621
That is the link, unlock and try the ROMs, but it probably won't work