Firstly, boot from a UEFI Windows 8 recovery disk (CD/DVD/USB) – I found that the automated recovery process didn’t find the correct Windows partition, nor when I managed to add it to BCD settings would it make it reliably bootable e.g. using BCDEDIT I got it to find and launch the Windows partition but it refused to cold boot or would not “keep” the settings after a 2nd reboot or power off. Go into the Advanced options and run the Command Prompt. Enter
Then assign a drive letter to the EFI partition:
Exit DiskPart tool by entering
Delete or rename the BCD file:
Use
The Reboot and cross your fingers. This gave me headaches. I was going in circles for a long while. There isn’t a lot of reliable info about fixing UEFI/Windows 8 at the time of writing. To re-enable Hyper-V, I also had to run the following from an Administrator Command Prompt within Windows after rebooting:
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