10-25-2007, 10:51 PM
Join Date: Jun 2005
PIN: s & needles
Carrier: T-Mobile US
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Correct. Delete the "vendor.xml" file. It can be found at c:\program files\common files\research in motion\apploader
Once you delete it you will be prompted to upgrade when you plug in and run Desktop Manager.
Note: it's not necessary to upgrade the OS in order to use your ATT Blackberry on TMobile. You will have the latest OS, though.