How to set missing serial number on MacBook Pro 2014

My MacBook pro model 2014 mid 15 inches, has lost serial number during upgrading the OS. I am having Catalina Os installed on the machine and have tried with a guide that tells about the Blank board serializer I write it to USB drive and when boot up the machine, Clicked EFI BOOT start normally nothing effect. All I want any other way of setting back my serial number. I am struggling for the last one month to fix the issue please help me out.

Solution 1:

If your MacBook is not properly serialized it should be done by an Apple Authorised Service Provider. It is to be assumed that perhaps it was forgotten (or not properly done) after a repair.

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