Chosen Solution
Hey everyone, as the title says, when I try and install MacOS High Sierra it only pops up with this message. Backstory: I previously installed Catlina on this computer with dosdude1 patcher. I can’t find any info online with this kind of pop up message. Dear iFixit gods @danj and @mayer please help.
This could be an issue with the system firmware. The OS installer maybe because the firmware level is not recognized by the installer.
