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You want to get the stock firmware from here
http://www.sammobile.com/firmwares/
This will put you stock and repair your device issues . you Dont have correct firmware
I have a problem with mw s3..no imei and service mode is blank. I found several ways to get back the imei but it requires the service mode. Would you please help me to open the service modeO no your fix is posted also for s3