Mac OS High Sierra USB Boot
I am currently using my 2020 iMac running Big Sur and want to repair my 2007 iMac running High Sierra.
Can I create a USB Bootable drive from my New iMac to aid me in fixing my Old iMac?
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You can't download High Sierra to a 2020 iMac. You need access to a Mac old enough that could run High Sierra in order to download a copy.