Hi

I have a problem with shim 15.8 and a Dell Latitude 5300 2-in-1 Notebook.
This Noteboot uses the latest Firmware 1.29
It is connected to Ethernet via a Thunderbolt USB-C Docking Station.

We do a lot of netbooting with a current shim 15.8. This shim is signed by Micrsooft, although the problem isn't Secureboot related.

When Netbooting on this specific machine we get a strange request via TFTP

RRQ from 192.168.16.97 filename loader/shimx64.efi.signed
tftp: client does not accept options
RRQ from 192.168.16.97 filename loader/shimx64.efi.signed
RRQ from 192.168.16.97 filename oader/revocations.efi
sending NAK (1, File not found) to 192.168.16.97
RRQ from 192.168.16.97 filename loader/?USB

Then the system fails and boots in a SupportAssist mode by Dell.

To verify it's not related to our shim i took the latest 15.8 shim from Canonical, with the same result.

Other systems, like Dell 5430 or vSphere or Proxmox VMs aren't affected. As for now this is the only system I know that has this issue

Other systems request the grub binary as expected after the revocations.efi is not found.