Sx56 Unlock, weird rom version

[sneeedle]

Ok, I have an At&t sx56 that I got when it was first released. I never used it, because the at&t GSM service SUCKS... I recently switched to
T-Mobile, I want to unlock the sx56 for use on T-Mobile.. But I cant find anything that applies to my rom version.

Rom Version: A.21.02 ENG
Rom Date: 10/17/03
Radio Vers: A.20.10
Protocol Vers: 324e4

I recently (before switching to t-mobile) tried to do the upgrade to PPC 2003 and my computer crashed halfway through, and fried the device. So I had to send it to siemens and get it completely reflashed, so naturally im nervous about doing anything with the rom. Is there a SAFE way to do it, incase my stupid windows box decideds to take a crap halfway through again? Could I possibly take the at&t rom off, and put t-mobile on? Or is there a better version all together? Pocket PC's arent something im very good with :shock:

[trever]

If you're new to the whole ROM flashing thing, I'd go with the XDA-Developers Special Edition ROM located here: http://wiki.xda-developers.com/wiki/SpecialEditionROM It's got a whole lot of goodies included with it, including XDA unlock (removed SIM lock). Or if you want to you build your own ROM at someone's ROMkitchen, like http://lumpistefan.dyndns.org/ Enjoy.