Hi @smithandrewc , by default u-boot loads the dtb from the rootfs and merges it with the one that was passed by cboot - cboot reads the one in the raw partitions like /dev/disk/…/DTB. So for a test, can you try replace the existing dtb with the one you edited in /mnt/sysroot/active/current/boot/ ? You mention using the eMMC version so I think that would be tegra210-p3448-0002-p3449-0000-b00.dtb