I flashed jetpack4.6.2 on my board(NX). Now I wanted boot system from ssd disk not emmc, so I changed the /boot/extlinux/extlinx.conf like [root=/dev/mmcblk0p1 ] to [root=/dev/sda1], then reboot system, but it still boot from /dev/mmcblk0p1 as usual. Please help me, thanks.