I had a USB drive prepared with the Windows 10 installer on in case of problems BUT this wouldn't boot either, I can see it accessing the USB for maybe 20-30 seconds while the motherboard logo is displayed (again no loading wheel), but again it seems to hit something it doesn't like and reboots the system and this just loops unless I stop it. I get the motherboard ASROCK logo (no loading wheel) for about a second or two, then it reboots and just carries on in a loop.
The process seemed to complete ok while I was still in Windows, but when I went into the BIOS to change the setting to disable legacy boot I found that Windows just flat out wouldn't boot in this mode.