IPXE boot no longer works after upgrade to 1.6. Error code 0216eb

[thesmj248]

Just updated from 1.5.10.(?) (the last stable version) to 1.6.0.14. Was using the FOGUefi mod with 1.5.10 to get Secure Boot working previously, but I doubt that’s relevant after the upgraded install.

Based on the info from ipxe.org this is a certificate error. But I’m not sure which certificate that might be or what I could do about it in this case.