@DaneLLL I will try JetPack 4.6.2 and see if this helps, however, we will have to validate our vendor drivers for this version so we do not want to upgrade from 4.6 yet.
@WayneWWW If i recall correctly flash.sh did indeed work on the 1920x2160 mode. I have definitely had the GUI before and it works in that mode on Xavier NX with JetPack 4.6. I will try with flash.sh tomorrow and update to confirm.