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Help ATT Vivid unlocked using on T-Mobile.. How to Update?

nozama

Lurker
May 14, 2013
1
0
Hey Guys,

I have a ATT HTC Vivid. I believe it's on 2.3.4 Gingebread. It's unlocked and on T-Mobile. The ATT SOFTWARE UPDATE does not work, it always says server unavailable. I'm using wifi.

I also tried taking the t-mobile sim card out, but then the software update would just be greyed out.

How would someone in my situation update the OS? Please advise and thank you for your time.
 

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