How to reset the system on Apple computers
1. First turn on your Mac, and then immediately hold down the Command (⌘) and R keys.
2. Release these two buttons when you see the Apple logo, rotating globe, or other startup screen.
3. The system may prompt you to enter a password, such as the firmware password, or the password of the administrator user of this Mac.
4. When you see the "Utilities" window, the startup is complete:
5. Restore from macOS After the feature launches, select a utility and click Continue:
Restore from a Time Machine backup: Restore your Mac from a Time Machine backup.
Reinstall macOS: Download and reinstall Mac OS.
Get online help: Use Safari to browse the web and find help for your Mac. This utility contains a link to the Apple Support website. Browser plug-ins and extensions will be disabled.
Disk Utility: Use Disk Utility to repair or erase your startup disk or other storage device.
The Utilities menu in the menu bar provides additional utilities: Startup Security Utility (or Firmware Password Utility), Network Utilities, and Terminal.
To exit macOS Recovery, choose Restart or Shut Down from the Apple menu 
. If you need to select another startup disk before exiting, choose Startup Disk from the Apple menu.
Refer to Apple’s official tutorial: https://support.apple.com/zh-cn/HT201314
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