[arch-general] efivars mounted read-write, but "operation not permitted, "

[Alive 4ever]

Are you trying to delete 'nvram' file on the efi partition directly or
are you trying to delete /sys/firmware/efi* ?

I think it would be saver to use 'efibootmgr' instead of manually
deleting 'efivar' or 'nvram' file.