[Q] Galaxy S3 unknown baseband - Galaxy S III Q&A, Help & Troubleshooting

I have a galaxy s3 demo unit and now I bought a galaxy s3 with broken screen , i have changed the motherboard and antenna and now I have unknown baseband and no IMEI , the motherboard was working before broken , there are calls and messages in history , i think is because the efs partition but I have no backup , what is the reason for that and what can I do ?

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And sorry for bad sentence
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