I am looking to flash JetPack 4.6 onto an nvme on a Jetson Xavier NX. The documentation says this can be done via initrd flashing, which requires installing Secureboot. The first installation step is to download “secureboot_<release_version>.tbz2” from the Jetson Download Center. But the download center only offers Secureboot downloads for the TX1, TX2, AGX Xavier, and Nano; and the latest is over 2 years old (32.3.1).
Is Secureboot still supported / necessary for for initrd flashing on the Jetson Xavier NX? If so, where is the proper secureboot_<release_version>.tbz2 hosted?