Samsung Galaxy S3, Factory mode after restart,no signal 'not registered on network'

Hi, i rooted my s3 i9300(inter) about 18months now . i restarted my phone and it is in factory Mode with a generic imei 0049******** not the original. Can someone please help me!!? i used cf auto root through Odin pc. Never installed any custom roms, only rooted the device, running android 4.3 baseband i9300XXUGNA8.

ANY HELP ON THIS MATTER WOULD BE APPRECIATED THANKS

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