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

[nozama]

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.

 

[dragongodcarnage]

Have you tried turning off your WiFi and then trying the update feature