I am trying to create a bootable SD card for my Xavier NX using the latest version of SDK Manager. After using the GUI to choose my target hardware as a Xavier NX, the target software as JetPack 4.5, and setting an ext4 formatted SD card as a destination for the target image, I run SDK manager to install image on the SD card. The operation apparently succeeds (I skip flashing the Xavier NX since it does not have bootable media yet), but upon insertion of the SD card into the Xavier NX and attempting to boot it up, it only runs a few successful tests before returning this error:
mount: wrong fs type, bad option, bad superblock on /dev/mmcblk0p1, missing codepage or helper program, or other error. I would really appreciate any guidance as to what I might be doing wrong here.
My goal is to eventually be able to build a kernel with a modified driver, which is why I am not using CLI and dd or an etcher to create the SD card (the tutorial for a modified kernel assumes SDK Manager was used to create the card I believe), but so far I am stuck at this first step of creating bootable media via SDK Manager.