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    Thread BASEBAND UNKNOWN, IMEI UNKNOWN, NETWORK UNKNOWN, No backup of efs

    I have a Samsung Galaxy S3 AT&T (I747) phone, when I tried to install android 4.3 Stock ROM which I downloaded from a 3rd party website I Baseband, IMEI and lot others became UNKNOWN . After a lot of googling i found out it could be because of the efs folder. But I didn't have any back up of it...