

Then it will popup install mac os high sierra or mojave welcome window. If you erased your entire disk instead of just the startup volume on that disk, macOS Recovery might.

And Shift-Option-Command-R isn't available.

The version of macOS offered by macOS Recovery might vary in some cases: If macOS Sierra 10.12.4 or later has never been installed on this Mac, Option-Command-R installs the macOS that came with your Mac, or the closest version still available. My friend was wiping my Mac so I could sell it and I’m pretty sure they’ve deleted the start up disk? It’s not letting me reinstall the OS on a recovery startup. No disk showing up for re-installing mac os sierra.
