wimboot not loading

[NiKiZe]

Intersting, What kind of hardware was this on?
memtest.efi (from Microsoft I assume) is correctly signed to work with secure boot, while ipxe.efi and wimboot is not (yet) signed.
So it would be intersting to know if it is common for
efi -> ipxe -> memtest.efi to work
but not
efi -> ipxe -> wimboot -> bootmgr.efi

Thinking it might be possible to have non signed ipxe solution working with secure boot enabled.

about your snp not working it's most likely becuse both snp and nii is supported on the machine, which unfortunatly results in no device working (But sounds weird if a 01:01:01:01:01:01 device is found)

ipxe.efi is the most compatible solution for efi since it support most native devices and also nii and snp as falbacks. (but not if no native drivers is supported and have both nii and snp)