I took out the SSD from the MacBook Air and stuck it into another MacBook from the same year. It booted onto the drive and continued to install the update. After the update was finished, I stuck it back into the MacBook Air and all was well.
Im assuming its because she updated from Mountain Lion to Mojave and didn’t install the firmware updates in between.
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I booted Mountain Lion off of an external drive and Installed each MacOS version one by one to make sure all new firmware updates are installed.
I took out the SSD from the MacBook Air and stuck it into another MacBook from the same year. It booted onto the drive and continued to install the update. After the update was finished, I stuck it back into the MacBook Air and all was well.
Im assuming its because she updated from Mountain Lion to Mojave and didn’t install the firmware updates in between.
I booted Mountain Lion off of an external drive and Installed each MacOS version one by one to make sure all new firmware updates are installed.
Everything works normally now!