So, I just downloaded the new Insider Build ISO (Build 15025) and was about to install it in Hyper-V from the ISO. This doesn’t seem to work – due to one of the most important security features out there – Secure boot. For some reason this particular ISO-image isnt signed correctly and wont therefore boot on a Gen 2 VM in Hyper-V.
You will receive the following message:
“The image’s hash and certificate are not allowed (DB).”
Its however easy enough to fix. On the VM, click Settings -> Security -> Un-check “Enable Secure Boot”.
No you should be able to boot the ISO just fine. 🙂
And don’t forget to enable Secure Boot again when the installation is done!
Happy Bug Bash!