Nokia Lumia 900 boot loop problem please help

[marlon2502]

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 battery and shut down and rebooted again and again. I left the phone on charge all night and it was the same in the morning rebooting.

I left the phone for a few days and I thought I would try it again and it was the same, but then I tried to back up the software and the phone worked again, it switched on as normal etc and worked fine.

I plugged the phone into Zune again and it told me to update again and I thought they may have fixed it so I updated it again and now I have the same problem stuck in boot loop mode again.

I decided to take the mobile phone to Maidstone Nokia Care Centre and they had a look at it and flashed the mobile using Nokia Care Suite as I went into the Techs room, the phone flashed to 100 % but would not start again it was stuck in boot loop mode.

The Nokia Tech thought this phone was a Uk phone even though I told him it was USA at&t network so obviously he flashed the phone with UK software, I then told him again that it was a UK phone again and maybe he had flashed the wrong software.

His manager heard me then and said he could not do anything else to the phone as it was a USA mobile and Nokia Care Centre only covers European phones.

Now my question is this I have the right software to go on the phone which I think is RM-808 At&t Cyan software.

But I cannot boot the phone fully although I can get it into download mode, the Tech stated that you can not do this on a windows phone so how can I reflash this device, can you do it using linux or maybe a dos based program can somebody please help me reinstall the correct software.

All help much appriciated thankyou.