If you're using Boot Camp to start up from Microsoft Windows, set Startup Disk preferences to start up from macOS instead. Then shut down or restart and try again.Some key combinations don't work when your Mac is using a firmware password.Once you are booted into Recovery Mode the macOS / OS X Utilities window appears. If you're using a keyboard made for a PC, such as a keyboard with a Windows logo, try a keyboard made for Mac. or hold down the Option key and choose Recovery HD from the Startup Manager. Or use your built-in keyboard or a wired keyboard. It worked for me (no need to change the date and boot off line from external drive). If you're using a wireless keyboard, plug it into your Mac, if possible. In the OS X Utilities, the Reinstall OS X option, installs the most upgraded and compatible OS for your MAC model.Some keyboards have a light that flashes briefly at startup, indicating that the keyboard is recognized and ready for use. You might need to wait a few seconds before pressing the keys, to give your Mac more time to recognize the keyboard as it starts up.Then press and hold the key combination after pressing the power button to turn on your Mac. If you can't shut down, press and hold the power button for up to 10 seconds, until your Mac turns off. Option () or Alt: Start up to Startup Manager. If you can't get a key combination to work when restarting your Mac, shut down your Mac first. Key combinations for an Intel-based Mac Command ()-R: Start up from the built-in macOS Recovery system.
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