For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
2informaticos, it looks like your file worked. It shows the correct serial number in About this mac, as well as system information. Would you be able to tell me what you did you fix the file? what it just the fsysblock and check sum? Thank you by the way. The computer has Yosemite on it so I am going to update to Mojave or newer to see if it still works.