Error 0x420c6095 on default selection

[NiKiZe]

Could you try ipxe.efi instead of snponly.efi, just to see if it's maybe an efi firmware issue and not related to ipxe itself. (for example that the efi firmware closes the device after a certain time of inactivity)

Compiling snponly.efi with DEBUG=snpnet:3,nii:3 might reveal something about what is actually happening, In that case maybe use sleep 5000 instead to not have the menu interfere with the output.

Testing different timeouts to narrow down what timeout works and what does not might be helpful in future debugs.