Hi, I have an Macbook Air 13 Mid 2013 i5 / 4gb. I bought a replacement logic board i7/8gb from ebay in order to upgrade my laptop. I've installed the new board and everything works great. But the Serial Numbers Appears as Unavailable. How I can generate a new serial number? As I understand the serial number printed in the case must have a relationship with the Logic Board. I saw on internet that I can use a software to set the serial number into the new logic board, is it right? Thanks for your help.