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Help USSD code not working and CSC incorrect

lspec

Newbie
Hi

I have an international S3, I have installed the latest stock firmware (BTU) as I am in the UK.

When i connect to Kies or try an OTA it won't work as the phones CSC is KOR at the moment.

I am not sure why its in KOR as I have never rooted etc.

I have tried to used *#272*IMEI# to reset the CSC but when i try any USSD i get a connection error invalid mmi code.

Does anyone know how to get the ussd to work or to change the CSC
 
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