If your MacBook won‘t recognize startup key combinations

If you use an Apple wireless keyboard with your MacBook (Retina, 12-inch, Early 2015) and later, startup key combinations don't work on the external keyboard. This might prevent you from being able to get to Startup Manager, Recovery Mode, Single User Mode, Safe Mode, or reset PRAM.

Use the built-in keyboard, or use a USB keyboard via a USB-C adapter, to access these and other startup features.

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