hello 18588523137,
after you used -k APP -G clone.img to backup APP partition, you’ve also backup the installation to rootfs.
you should taking this clone.img to replace original system.img to deploy your Xavier-B. i.e. $ sudo ./flash.sh -r jetson-agx-xavier-devkit mmcblk0p1.
you may boot-up the device to install all of them on the target.