Hi all !
I'm so sorry ! But , My English is very bad.
I have a pc :
CPU 3900X
Mainboard : Giga Gaming X X570
RAM : 32G
VGA : Radeon RX 570
and EFI include file. Install Mac Catalina 10.15.3
When testing: sudo nvram -c
A notification :
nvram: Error clearing firmware variables: (iokit/common)...
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