ipxe initialising devices

[bluedark]

Hello,
My hyper-v gen1 VMs don't boot on my ipxe, and some client workstations too.
I get stuck on "ipxe initializing devices ...".
I am on windows server 2019 up to date.
On the other hand, it works well under windows server 2016.
I have tried with several versions of the undionly.kpxe file, with some it works but the nfs does not work, while I need the nfs to fetch my installation sources.
Thank you in advance !

[bluedark]

i solved my problem using undionly.kpxe file from a debian 10.4