Upgrading Verizon XV6900, Enable GPS?

[tgerbert]

I'm seeing a lot of information scattered all over the place regarding upgrading ROMs to enable GPS and such, really just enough in any one place to really confuse me. So I've got a couple questions...

1. I come from the PC world where a device's BIOS is separate from, and independent of, the software installed. So does updating the ROM on a PPC just change it's firmware, or does that also include the installed software... i.e. Windows Mobile, Office Mobile and such?

2. I've got a Verizon XV6900 and my only gripe is GPS... is it possible to update it and effectively change only GPS functionality? I don't want to blow out Office, Acrobat, or the touch keyboard, "Today" screen, etc.

3. Is it possible to backup all the current ROMs (so I can put it back to factory in case of a problem)?