Lenovo Thinksystem ST550

[NiKiZe]

Indeed something with your hardware does not work well with the ipxe buildtarget in efi mode.
Do you have more NICs in the same machine? and for reference could you post all nic pciids in the machine (grab them with lspci -nn in linux or similar)

snponly.efi and snp.efi should work in most cases but does not give you native drivers, this means that it sometimes is slower. But on the upside it should be more compatible so long as the firmwares SNP or NII implementation isn't broken.

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