Reboot the laptop by holding Option (⌥) this time. The installation requires network to do verification. I fogot it and had to recover the factory macOS version to just create a user so that I can allow booting from external media.Įnsure there’s a working Internet connection. 2 This step is very important and must be done before erasing the disk because it requires verifying the admin user password in the installed system. Choose Utilities > Startup Security Utility from the menu bar and allow booting from external media. Reboot the laptop into recovery mode by holding Command+R. The option -downloadassets is optional but is recommended, because without proxy, it is slow to download resources during the installating stage in some regions. Assuming the stick name is MyVolume, create the installer using the USB stick with following command 1 sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -downloadassets -volume /Volumes/MyVolume Insert the USB stick which has at least 8GB capacity.
#Install macos big sur from usb install#
This will install the app Install macOS Big Sur.app into /Applications.
Follow these instructions if I want to sell, give away, or trade in my Mac.
I plan to erase the disk and install a clean copy of macOS, so the first step is creating the bootable installer.īack up the data. This article is a reference for my own reference in case I need to do it again.
My MacBook’s battery capacity is significantly reduced and it has many weird issues so I decide to do a clean installation of macOS Big Sur.
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