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The first step is to get the DMG disk image file for the version of macOS that you want.

Part 1: Download macOS or Mac OS X DMG File The bootable USB flash drive made by UUByte DMG Editor on a PC is recognized as a valid macOS Monterey installation media on a Mac. : Below is the latest successful example of macOS Monterey. All the steps except the last one are done on a Windows 10 machine.

This article shows you how to download a macOS DMG file, format a USB drive using a GUID Partition Table, burn the DMG to the drive and boot your Mac from the USB. But how do you create such a disk if all you're left with is a Windows 10 computer? Fortunately, there's a great tool that you can use for free to create bootable macOS media on a USB drive in a Windows 10 environment.

If your Mac suddenly refuses to boot up properly, you might need a bootable macOS USB installer to make repairs.