An answer provided a video that solved the issue but this screenshot should contain all essential. However neither of these can really be done from an OS except for OS X. Instead the createinstallmedia command is used. dmg and restore that in Disk Utility to create a bootable installer, however now that is a lot harder. The only difference to Apple is that you need to make the ISO file into special DMG file and upload that. The OSX installers aren't usually iso's, in the past you could extract the. Plug the USB Drive in to your Mac and open Disk Utility (found under applications / utilities in finder) Select the USB Drive Select the Erase tab Ensure. Now we make only a small difference to this procedure to get it working with Apple computers, namely converting the ISO into special format usually labelled with DMG or just IMG. Wait patiently - 5 to15 minutes - until the Utility Menu appears. This so far is very close to working with distros such as Ubuntu here. Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears. $ sudo diskutil umount /Volumes/UNTITLED\ 1/ Now you know the address to be something like /Volumes/disk1s1 and for the mount-point like /Volumes/Untitled 1 but Apple requires some syntactic sugar in $ sudo umount /Volumes/UNTITLED\ 1/ umount(/Volumes/UNTITLED 1): Resource busy - try 'diskutil unmount' but it won't stop us! So everything as one-liners below, enjoy! $ sudo watch -interval=1 'dmesg|tail' Option number 2 is a bit more cumbersome and takes more time but there are many benefits to it. You can find the Debian-style-/dev/sdb location after $ sudo port install watch and then getting the address from the kernel ring buffer with $ sudo watch -interval=1 'dmesg|tail' so There are two ways to install a new macOS: 1) run a regular upgrade via Appleās main menu (replace your current macOS with Big Sur on your startup drive) 2) start from scratch and clean install macOS.
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