I have a notebook that came with Windows 8.1, but formatted the HDD and installed Linux to a 64GB partition after a failed Windows 10 upgrade. Now, I want to dualboot Windows 8.1 with Linux. I selected USB in the Boot Device Menu, but I get a error that reads:
The selected boot device failed. Press ENTER to continue.
It happens on both Legacy and UEFI mode.
I tried made the installer bootable by:
- Using Disk Image Writer on Linux (did not show up in Boot Menu afterwards).
- Creating a NTFS partition, copying all the files from the ISO into it, and adding a Bootable flag. (caused "Boot device failed).
I know the ISO works because it booted from it in a virtual machine.
How do I get the Windows 8.1 installer to boot?