AT & T branded phone bought in UK. How will I get Android 7 uograde

Hi I got a good deal on a Galaxy 7 edge phone sim free.
Found out why it was cheap it was AT & T branded a US phone.
I have a sim only contract from EE.
How will I get 7.0 android upgrade?
When I try and upgrade I get a message about checking AT & T servers but it never finds update.
every time phone gets rebooted I get a message saying Class 0 Message
The number you have sent to is incorrect.
I was I had payed a bit more and got uk spec phone.

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