Hi, for now we only support L4T 35.1 for the Jetson AGX Orin.
A couple days ago Nvidia released L4T 32.7.3 for the TX2, TX2 NX, Xavier, Xavier NX and Nano line-up and once that is available our yocto upstream - meta-tegra - the plan right now is to integrate and release this version for all devices supported.
After that we can have a look into integrating L4T 35.1 or newer for the Xavier and Xavier NX boards. However, this is not straight forward and will need to be investigated thoroughly on our side because the L4T jump from 32.x to 35.x involves a switch from cboot to UEFI as well as a partition layout change, and both are breaking changes for balena.