For what it’s worth, I couldn’t boot to any form of backup. My fault for not creating and testing one before upgrading.
As long as you can get the required EFI files on a USB, you should be able to use the UEFI shell to copy them across (using commands others have described) without needing to...
I encountered what I assume is the same issue after upgrading to Clover r4586 from a much earlier version.
This was running MacOS 10.13.4 (although I have since upgraded to 10.13.5 without issue).
I use FileVault2, and the symptom was a black screen after selecting the FileVault Prebooter from...
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