Restart your Mac, then immediately press and hold Command + Option + R until the spinning globe appears. If your Intel Mac is manufactured from late 2011 onwards and runs Mac OS X 10.7 Lion or later, you can utilize Internet Recovery without extra software. To drive your Mac to search for an updated reinstall certificate online, you need to switch to Internet Recovery, which starts with a built-in ROM that allows your Mac to connect to the internet and download recoveryOS and bootstrap reinstalling OS X. That's likely because your laptop's certificate for Mac OS X reinstalls has expired. Suppose you can't reinstall macOS with Command + R, which starts your Mac from the built-in macOS Recovery System. Step 1: Restart in Internet Recovery Mode.
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