Problems during U-boot stage: Unable to read file ubootefi.var, Failed to load EFI variables #37

Device: 2020 Macbook Pro M1, MacOS13, I've got the following errors:

Failed to load '/'
** Unable to read file ubootefi.var **
Failed to load EFI variables
BootOrder not defined
EF1 boot manager: Cannot load any image
Found EFI removable media binary EFI/boot/bootaa64.efi
192512 bytes read in 0 ms
Booting ref i\boot bootaa64.efi