Ryzen boot - fails....Exiting efiboot

Trying to boot AMD Ryzen - Catalina bootloader. I'm getting errors I don't understand - Exiting efiboot....
See attached screenshot.
I then get taken back to the picker. Endless cycle.
I've built several hacks, and have successfully loaded Big Sur on a separate NVME drive on this machine. I would like to have dual boot, as I've been encountering unresolved glitches with BS.
I'm pretty sure the EFI contains everything I need - so I guess there's a problem with the config.plist. I've recreated...

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Author: Bicyclegroup

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