11-23-2008, 12:11 PM
Join Date: Feb 2005
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I'm not sure about T-Mobile, I have AT&T. So, if someone else doesn't give you a better suggestion: I'd try loading it via OTA from the blackberry.com web site. If that doesn't work, I'd try loading it through desktop manager.
You may have to resend your service books too as the version with 4.5 now requires a service book.