I was given a broken Lumia 900 from a friend(phone would not turn on). Found out it was still under warranty and just got it back from Nokia. To my surprise, I found out that this particular Lumia 900 is a AT&T store demo unit. I've tried to do a factory reset but it keeps installing the store demo UI (apps and accounts) every time I do. Is there any way to stop it from installing the store demo UI? like upgrading to 7.8, or do I have to do this the hard way and flash the phone?
details:
OS: 7.5
OS version: 7.10.8112.7
Firmware: 2175.1002.8112.12084
Hardware: 112.1914.2.0
details:
OS: 7.5
OS version: 7.10.8112.7
Firmware: 2175.1002.8112.12084
Hardware: 112.1914.2.0