So i purchased this computer to repair, and it did not come with an SSD and the battery was bad. Well after opening it up I saw one of the antenna connectors was gone as well. So I put in another known good battery, SSD as well as repaired the antenna cable. After getting MacOS installed, the serial number is not displaying. I found a post somewhere about using a program or something to "program " the serial number back into the board. Is this possible? The machine works great now except for the missing serial number. I heard also that you could take it to the Apple store and they could do it but where is the fun in that?