how to reset pram on high sierra macbook air

Createinstallmedia commands for different macOS versions.Create a macOS bootable installer on a flash drive.Use Internet Recovery to reinstall macOS.Restore a Mac without a Recovery partition.Try this fix to force the Recovery partition to appear.Use Terminal to check if your Mac has a Recovery partition.How to check if Recovery partition is working on Mac.If your Mac runs macOS X Snow Leopard or earlier.If your Mac is running macOS Sierra or earlier.Did you accidentally delete the Recovery partition?.Possible reasons why Command + R isn’t working on Mac.So, if Mac Recovery Mode is not working and you can’t figure out why the usual Command ( ⌘) + R process has gone south, you’re at the right troubleshooting guide. While this official troubleshooter works well most of the time, it has had its fair share of issues. Whether you’re trying to fix a stubborn problem, repair or erase a hard drive, or reinstall the latest macOS version, macOS recovery (launched in 2010 with OS X 10.7 Lion) is the way to go.

How to reset pram on high sierra macbook air