Unknow imei and baseband, how to fix? Flashed stock firmware but still unknow

Hi all, 1 month ago my s6 edge fell in water and then i went to an assistance and they fix it but now i can't get any signal from my sim the imei and baseband are unknow. (I remember that before my phone turned off after fell in the water it losed the signal) How can i fix this? I tried to flash stock firmware but it was still unknow. Please help me Thanks

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