![]() For example, copy them to a folder named iso-files located on D: drive. ![]() Copy its contents and paste to a folder on your internal or external hard drive. Open Windows 10 installation disc in File Explorer. ![]() Also hitting "AnyKey" during boot, as suggested elsewhere (very funny), did not help. To make it as a bootable ISO image, follow these steps, here will take Windows 10 as an example: 1. I found hints to press F12 or fn-F12 "during boot" for getting into the shell, but I tried it several times to no avail. While preparing the High Sierra VM, I had a hard time getting out of the UEFI shell and selecting the correct boot.efi in order to boot the system.īut now I want to get into the UEFI shell, then to the boot options. This will mark the external hard drive as the booting media for your operating system. Step 4: From the menu, select the external hard drive and confirm your selection. Press and hold the BIOS key until the startup manager window appears on the screen. So each time I start the update from macOS, the reboot gives me an unaltered system. Step 3: As soon as the screen turns off, press the BIOS key destined for Mac devices. Unfortunately, the UEFI boot settings of VirtualBox seem to overrun the macOS settings and the system always boots the regular macOS partition. The reason for that, as far as I understood, is that the macOS update is installed onto the recovery partition of the VM hard drive and the VM should boot from this partition to finish the update. ![]() The VM runs fine, but I am not able to update the guest OS from 10.13.4 to 10.13.6. I am running VirtualBox 6.0.10 on an iMac (Mojave) and I prepared a macOS High Sierra VM from the ground up with VirtualBox. ![]()
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