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After watching WWDC20, I updated my MacBook Pro to the latest development version. macOS Big Sur, buggy more, a little used to it. But when I went back to 10.15.5, I was prompted that I could not go back to the old version, so how can macOS Big Sur be degraded? https://www.macz.com/news/4962.html

If there is no backup, now find a U disk to copy the data out, reinstall the new system, software reinstallation.

1. Download macOS Catalina (do not install)

macOS Catalina for mac (macos 10.15 system)

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2. Plug the USB flash drive into the computer, and enter sudo /Applications/Install\ macOS\Catalina.app/Contents/Resources/createinstallmedia--volume /Volumes/ MyVolume (Note: Replace MyVolume in the command with your volume name accordingly) to make a USB flash drive. Start

3. Restart the computer and press Option to select USB flash drive to start, install the new system

Press the keyboard left and right direction keys to select the installation disk, press enter, will restart

First erase the computer disk, select Disk Tools, click Continue

Delete files from system disk partition, select Delete

Click erase

After successful erasure, click Done

In this way, the data in the system disk will be deleted, turn off the disk tool, return, install macOS

Next, go to the installation interface, you can see how Mac reinstalls the system? macOS online reload system graphic tutorial.

If you install other versions of the system disk used by the command, also for everyone to organize a good

system burn command

Make a High Sierra boot drive (note: the USB drive needs to be named Sierra):

sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Sierra --applicationpath /Applications/Install\ macOS\ High\ Sierra.app --nointeraction

Make Sierra boot drive (note: USB drive needs to be named Sierra):

sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Sierra --applicationpath /Applications/Install\ macOS\ Sierra.app --nointeraction

Make macOS Mojave boot drive (note: USB drive needs to be named Mojave):

sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia --volume /Volumes/Mojave /Applications/Install\ macOS\ Mojave.app --nointeraction

If you install an older version, you may get an error during installation, as shown in Figure

Apple recommends installing the latest version. If you install the 2015 version of Sierra, you will get an error if you do not update the old version date. We only have to modify the date to install it.

Disconnect the network first,

Click Utility, click Terminal,

Enter the following command, which may vary depending on the system selected

Command to modify system time during installation (it is recommended to turn off Wi-Fi before entering the command):

date 032208102015.20（macOS High Sierra ）

date 010514102017.30 for macOS Sierra 10.12

date 0201010116 (for OS X El Capitan 10.11.6)

date 112202022015 date 122014102015.30 (available on 10.10)

After the input is completed, enter, exit the terminal, and then install it.

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