But then I was facing multiple issues trying to update macOS from Mountain Lion to High Sierra via the Mac App Store.Īfter downloading a copy of macOS High Sierra from the Mac App Store, I started installing the update.
I successfully installed the macOS Mountain Lion (when using the NetBoot it automatically selects the version of macOS with which the iMac was shipped with). I thought that it would be easy to do but I was mistaken. Recently my sister asked me to reinstall the macOS High Sierra on her iMac because it stopped working correctly.
