Yes I m already fixed it by root my device....
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When I m using nougat version in my device...I m get new oreo version update by Motorola official....after upgrading my imei null...after I m flashing nougat and imei problem fix by root.
Wait, so every time you update to Oreo, you lose your IMEI? That should not happen, and if it keeps happening when you update, I would therefore suggest you stay on Nougat and disable the OTA updater.