Clients stuck at iPXE initialising devices

[pcnr]

Good morning everyone!
I had issues like many people on new DELL computers stuck at “EFI STUB”, so I decided to upgrade Fog
I use a custom CA so i did the reinstallation with recreate-ca, then re-copied my certs, re-built the binaries and copied them to tftboot (everything as explained here)
Now when I try PXE boot a new DELL i’m stuck even before EFI STUB
Computer is stuck at autoexec.ipxe… Not found

As usual the PC I’m booting have secure boot disabled, virtualization disabled, AHCI instead of RAID
Any idea?
All suggestions are welcome, thanks in advance!
P

You’re running the latest stable version: 1.5.10.1763
bzImage Version: 6.12.35
bzImage32 Version: 6.12.35
arm_Image Version: 6.12.35