After using SDK Manager (latest) to flash OS to AGX-1 the AGX-1 is now stuck in endless reboot showing nVidia splash screen, and then black, and then nVidia splash screen.
I expected SDK manager to reset everything, but it appears that the boot sequence is wrong. I had previously flash JP4.4.1 and modified boot to use sda1 rather than mmcblkp01 for the /dev/sda1 (see below).
sed -i -e "s/mmcblk0p1/sda1/" /mnt/boot/extlinux/extlinux.conf
Is there a special mechanism for full factory reset on AGX-1 prior to use of SDK Manager? I have been unplugging AGX-1 and then pressing center button and holding and pressing left button (front); successful in recovery mode and USB connection to Ubuntu18.04 VM on macOS11.2.3 using VirtualBox (latest).