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WARNING: doing this will absolutely DESTROY YOUR SYSTEM, PERMANENTLY!!!

But if you wish to continue, you can erase all the EFI variables using the rm utility, I dont think you will be able to completely zero out the chip on the system from inside of Linux as its read-only.

But to delete all the EFI variables, cd into /sys/firmware/efi/efivars, if this directory is not availiable, either the efivarfs is not mounted, or you are booted in legacy BIOS mode. But once you are in this directory, run chattr -i ./* as root or sudo to remove the immutable bit on all the files, then run rm ./* as root. This WILL break your system. Only do this if you know how to restore your system using like a chip programmer.