I get "boot0af: error". I have to choose a theme for strength?
Have a look at the Clover wiki - are you sure you have correctly formatted the EFI partition to FAT32?
When installing Clover in legacy mode for my legacy BIOS machines, I usually install into the EFI eg
I don't have this option.
Make sure your config.plist scans for tool entries in the GUI section eg
Personally, I would have another go at trying to add Clover as a UEFI entry in your BIOS startup options. There are 2 main ways:
1. Through an EFI shell. See Part 4.1 of @Rednous's guide.
2. Through EasyUEFI in UEFI Windows. See Part 3 Install Windows/Add Missing Clover UEFI Entry of @GhostRaider's guide.