Here's what you need to do:
- Go to BlackBerry Upgrade
and log in. You may have to hit F5 (rety) if it says it is busy. be persistent.
- Download the latest code for the 8100 from T-Mobile (it is 126.96.36.199). If you want the LATEST code, download 188.8.131.52 from Cingular.
- Execute the program you just downloaded
- Locate and Delete VENDOR.XML from you PCs C: drive
- Restart Desktop Manager and the upgrade should start.
Good luck and welcome.