Upon purchase of your Mac from, you’ll get a receipt via email where your device’s serial number is indicated. We are not liable for any damage it may cause to your Mac. Perform this procedure at YOUR OWN RISK.Be warned not to use this software if you worry regarding the copyright or legal issues that may or may not be involved in running and/or using the said software. The software that will be used in this article may or may not be for Apple’s internal use only.DO NOT PERFORM THIS PROCEDURE IF YOU CANNOT DEAL WITH A NON-WORKING MACHINE. If you mistype any part of it, you’ll likely end up with a non-bootable system. You only get one chance at inputting the proper serial number during the “write” phase of the how to. You’ll be using the same serial number that the computer originally had when you first purchased it. Therefore this fix is truly for your genuine Apple hardware that has lost it’s serial number along the way on its logic board. The serial number is NOT transferrable between machines. You not only need a valid serial number, but you need a valid serial number for the hardware you will be performing it on.Performing this method will void any valid warranty your Mac may have.

If you have an Apple warranty for your Mac that is still valid, it’s best to contact Apple Support first hand in order to have the serial number fixed.However, here are some VERY IMPORTANT reminders you should know before trying to fix this issue on your Mac’s serial number:

The sample screenshot below shows that the Mac’s Serial Number indicates “Unavailable” which means the Mac has somewhat forgot its serial number for some unknown reason. However, problems may surface over time wherein some services such as iMessage or FaceTime will no longer allow you to log in. You can still install programs, log in to the Apple Store, use iMessage with your friends and colleagues, and so on. For the most part, you can go along just fine with your Mac not knowing its serial number or revision (manufacture year).

Mac serial number model check