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system_protocol [2021/09/12 12:44] – 134.190.232.139system_protocol [2021/10/11 19:14] (current) – 134.190.232.9
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   - In this way user can downgrade the macOS system. https://support.apple.com/en-ca/HT201372   - In this way user can downgrade the macOS system. https://support.apple.com/en-ca/HT201372
   - To install the new system, Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac.    - To install the new system, Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac. 
 +  - To install back MacOS, need to erase the original ubuntu on the MAC first. https://support.apple.com/en-us/HT208496 (Test OK)
  
  
system_protocol.1631461457.txt.gz · Last modified: by 134.190.232.139