TensorRT engines aren’t portable across different GPU devices or across different versions of TensorRT. For example on TX2, the TensorRT engines need to be built on another TX2 running the same version of TensorRT.
Sorry, Jetson TX2 will remain on JetPack 4.6.x and won’t be receiving newer versions of TensorRT. For more information, please refer to the Jetson Software Roadmap.