How to flash uefi using shell?

I have connected my jetson xavier nx emmc to my computer

build image from GitHub - NVIDIA/edk2-nvidia: NVIDIA EDK2 platform support

I using “./flash.sh -k A_cpu-bootloader jetson-xavier-nx-devkit-emmc mmcblk0p1”

and it told me that (A_cpu-bootloader is not supported)

Please use the following command to update UEFI instead.

$ sudo ./flash.sh -k cpu-bootloader jetson-xavier-nx-devkit-emmc mmcblk0p1

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