Just download the newest ROM from
http://www.myzaurus.com/ . When you extract the software package, you browse to (as an example) C:5500v31uupdaterom or wherever you extracted it. In any case, it will be in the updaterom folder. Look for a file called Ospack. That file is your retail ROM. If you want to flash back, just put that file on your CF card and follow normal procedure. Remember, if you have your current retail ROm setup in a way you like, remember to back it up! While experimenting with other roms, I had mine set up to work with my wireless network and a few contacts listed. It\'s nice not to have to do all that over again.