By refreshing the TensorRT engine, I meant the *.engine file that is created for your model (it should be in the same directory as your model). If you delete it, it will re-run the model optimizations and create a new *.engine file. I didn’t mean to indicate that you should re-install the TensorRT libraries or JetPack.
There was a cool robotic arm project posted recently using Jetson, check it out here: