Please Help Nokia Lumia 900 Prblem

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http://forum.xda-developers.com – Hi all I have a problem with Nokia Lumia 900 locked to At&t network, I purchased the mobile from **** usa with broken screen, I fixed the screen and the phone was working 100% except that I could not test the phone for calls as it was locked to At&t network and I am in the United Kingdom and I was waiting for unlock solution. Anyway I plugged the phone in to Zune and it reported there was an update for the phone so I let it update and it got to 100% and finished, now the phone was in boot loop it kept restarting and getting to were it nearly switched on then reported it had a low ba (HowTos)