Chosen Solution
Here’s an odd question: I’ve been told that my early 2015 Macbook Air somehow has the wrong logic board - an earlier version, put in by a disreputable repair shop - and that’s why I can’t install Macos Monterey. Is there a way to get the serial or other identifying number of the logic board that’s in there without opening up the back of the computer and then match it to a list so I can test this? Thanks Update (02/01/2022) Sure, I wasn’t sure how to do that so hope this works. Thanks.
Yes! You can without needing to open your system. Go into About This Mac under the Apple menu and copy your systems Serial Number then paste it here EveryMac - Lookup That will get you your systems details. Let us know what it gave you. Update (02/12/2022) @prouss - Well, sadly your battery is not healthy! Both the cycle count and age tell me its struggling! As you can see here the battery is not expected to run much past 1,000 cycles Determine battery cycle count for Mac notebooks and this is still the original battery! Age also plays a role as the chemistry breaks down. Sadly, its time for a new battery! MacBook Air 13" (Late 2010-2017) Battery and the guide to put it in MacBook Air 13" Early 2015 Battery Replacement
Just getting back to this after a busy month - thanks for the help, I have a new battery on the way and I’m sure it’ll improve performance. But thought you might be interested, I found the original work report from Apple (attached) MBA Logic Board Issuethat said there was an incorrect logic board, a 2013 in my 2015 machine. I suppose it’s actually something of a miracle that overall it still works pretty well! Also interesting is that while I had previously at least been able to download Monterey for installation (even if it then failed), Software Update now does not even find it as an available update.
