Navigating from Hyper-V to desired image (.vhd, vhdx) on backup drive. I can see the image I want in the directory, but viBoot is permanently greyed out. Getting nowhere. I've turned off Image Guardian; doesn't help. I've tried connecting to several backup discs. Repeating motions, but no joy. What am I doing wrong or what am I missing? Advice appreciated in advance.

Sorted, thank you. I had forgotten to switch on viBoot on when I originally installed Macrium.