stuck with black screen after Catalina update

I tried updating to Catalina without tidying up the EFI folder, and assuming I had the most-recent-back-then version of Clover, but I have the 2.4

the still-Mojave-named boot from Clover launches the Apple logo, and the load animation goes all the way and gives me hope, but then moves on to a black screen.
Same happens when launching recovery installs from Clover.
I didn't keep my bootable USB key, so for now I'm stuck with black screens and not being able to run a terminal or post-intall...

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Author: ferachoglou