1. First, press and hold command+r when the macbookpro computer restarts, and you can enter the macOS utility interface, which is the OSXrecovery interface.
2. Secondly, choose to reinstall macOS, then enter the password of WiFi, then enter the macOSsierra interface, and click Continue.
Finally, in order to download and install macOS, the computer will first verify whether it meets the installation conditions.
4. After the test, click Agree, and then wait for the macbookpro to be inserted into the computer disk. After downloading, macbookpro can be plugged in, turned off and restarted.
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