Hyper V generation 2 machines don't boot

Solution 1:

I found my solution doing this simple steps:

• Create a Gen2 VM.
• Create a vhdx and inserting (in creation process) the ISO file.
• Try to boot the machine holding down the space bar (the machine not boot)
• Turn off the machine
• Edit the machine settings
• Uncheck "Secure Boot"
• Put the DVD in position 0 from the SCSI order.
• Put VHDX in the position 1 from the SCSI order
• The most important: Remove the network adapter.
• Start the machine HOLDING DOWN THE SPACEBAR.
• Install the OS.
• After the OS installation, turn off the machine and recreate the network adapter (if you need that).