[SOLVED] Problem with migration from Hyper-V (vhdx)

[.n3]

Hey,

I have a hyper-v vm with windows and I want to use it in proxmox, I tried two tutorials:

https://broadband9.co.uk/how-to-migrate-hyper-v-vhdx-vm-to-proxmox-qcow2/
https://www.servethehome.com/converting-a-hyper-v-vhdx-for-use-with-kvm-or-proxmox-ve/2/

I had a vhdx with two avhdx and I merged them to one vdhx with Hyper-V. I also tested the new vhdx without any problems.
Everythink of the howtos works fine until I start the vm. I got the message, that there is no bootable device and the vm is in an restarting loop. It is not possible to shut the vm down:

trying to acquire lock... TASK ERROR: can't lock file '/var/lock/qemu-server/lock-200.conf' - got timeout

Any idea?

 

[.n3]

Solved with UEFI BIOS.