Replacing T-Mobile OS with ATT OS

I just ordered a Curve 8320 on Ebay and I thought I might as well get this out of the way before it arrives. The curve I ordered is locked to T-Mobile and I plan on unlocking it for use on my ATT account. Can I replace the T-mobile blackberry OS with the ATT one? And is there anything special I have to do before I can change carrier OS's? Or can I just install it over the old one?

Thanks

Just make sure its for the 8320. You can install it, follow the instructions carefully

http://forums.crackberry.com/f52/new...elease-112198/

Make sure to delete the vendor file before installing the os.

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