I restored the default settings to Secure Boot. Big mistake

[dorf]

I tried to get the latest secureboot certificate for my old Dell 7010 Optiplex machine.  
I restored the default settings to Secure Boot. Big mistake.
 Now when secure boot is on. The machine doesn't boot and complains about no booting devises. 

The computer's secure boot can't find where to boot and the information apparently has to be entered manually.
 Secureboot's settings are now years old and it can't find a new configuration. 
What could be done here?
There are plenty of files to choose from in the secureboot menu, but I don't know what to put there for each of the four

Windows 11 upgraded from 10..... originally who knows what (used machine)

without secureboot it booting normally

 

[binaryzero]

Leave Secure Boot off, the Optiplex 7010 isn't getting a firmware update to support the changes...

[+Warwagon MVC]

See if this article I wrote the other day works for you.