I erased the disk and on start up there is a folder with a question mark flashing.
I erased the disk and on start up there is a folder with a question mark flashing.
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On startup...
Command (⌘)-R Install the latest macOS that was installed on your Mac.
Option-⌘-R Upgrade to the latest macOS compatible with your Mac.
Shift-Option-⌘-R Install the macOS that came with your Mac, or the closest version still available.
I erased the disk and on start up there is a folder with a question mark flashing.