When you see your Mac has powered down, hold down the power button until you see a prompt. Step 1: Download and install UUByte DMG Editor on Windows 10 using the official ISO installation file, which you can download from the UUByte website here. Split the Windows image file into smaller files, and put the smaller files onto the USB drive: Dism /Split-Image /ImageFile:D:\sources\install.wim /SWMFile:E:\sources\install. Here’s how you change the startup drive from recovery mode with an M1 or M2 Mac: Select > Shut Down. If your image is larger than the filesize limit:Ĭopy everything except the Windows image file (sources\install.wim) to the USB drive (either drag and drop, or use this command, where D: is the mounted ISO and E: is the USB flash drive.) robocopy D: E: /s /max:3800000000 Step 2: Connect the USB flash drive or other volume that youre using for the bootable installer. Windows USB install drives are formatted as FAT32, which has a 4GB filesize limit. Step 1: Download macOS Big Sur from the App Store here. Follow the instructions to install Windows. Select the option that boots the PC from the USB flash drive. Turn on the PC and press the key that opens the boot-device selection menu for the computer, such as the Esc/F10/F12 keys.
For more information, see Automate Windows Setup. Optional: add an unattend file to automate the installation process. Use File Explorer to copy and paste the entire contents of the Windows product DVD or ISO to the USB flash drive. Step 2 - Copy Windows Setup to the USB flash drive As for the booting Disk in the first episode, the USB-key’s EFI partition must be mounted. If Mark Partition as Active isn't available, you can instead use diskpart to select the partition and mark it active. In order to be able to install Big Sur, the key must also undergo a change with Open Core.
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