MacBook Air 2015 - 13"

This Macbook Air is mostly decent to use for a younger kid or lower level user wanting to use a Mac. Unfortunately due to however the previous owner formatted the hard drive, I can not figure out how to upgrade it beyond MacOS Big Sur. That is why I'm pricing it so low. However it still functions decently for a 2015 model! It has 93% battery health with 472 cycles. I was using it for nursing school until I upgraded mainly because it was struggling with our textbook and testing software which is rather intensive, but otherwise Office and the Mac equivalents work well on it and browsing the web is still a breeze. I even used Photoshop on it and while it was slow, it functioned within my use case which is relatively limited graphics editing.

I've been sitting on it for quite some time and just hope someone can get better use of it than me. Perhaps you can even solve why the upgrade cannot be completed (the disk seems to have not been formatted properly).