[Q] IMEI corrupted at&t galaxy s 3

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http://forum.xda-developers.com – Hello, ok i need some help, i was running my at&t galaxy s3 on cyanogenmode 10.1 RC4, upgraded it to RC5, out of the sudden my IMEI was gone, super poor signal and very limited connection. I went back to factory settings thinking it would help, needless to say nothing happened. Does anybody knows a way to fix that issue? (HowTos)