I have the same problem like nanianmichaels. I have a jetson nano dev-kit 2GB. I tried Armbian 23.8 Bookworm Cinnamon. I ran official Jetpack 4.6.1 before, since I read it should automatically update u-boot. Running/Booting Armbian 23.8 Bookworm Cinnamon from SD-Card gets stuck at Nvidia Startup Screen.