No service after 4.3 update

Hi. I've tried to update my s3(I9300) from 4.1.2 to 4.3 , with odin (without making a backup) and now when i insert the sim card i get the "unregistered on network" error . Also the imei is changed. I installed other stock firmwares but no luck. Is there any solution to this ?
Thank you.:(

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