hello aidev,
you may setup an environment with NVIDIA SDK Manager to download NVIDIA JetPack SDK. it’ll install the release image to your local host, you may also enable flash script to re-flash the board.
please also check developer guide for the Flash Script Usage.
BTW,
you cannot use both modules (Nano, Xavier NX) with the same carrier board, please also refer to Topic 144055 as see-also.
thanks