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@engineerfranko
We can close this off for now, having spoken to HP they are now aware of ipxe not working. However on our end we changed to load snponly.efi and this allows it to boot using the newer BIOS.
@Sebastian-Roth
Managed to get this to work by downgrading rEFInd to version 11 as per this: https://forums.fogproject.org/topic/11993/refind-pxe-booting-issue