There are few ways by which you can restart or reset the Jetson Nano device. Try out the below methods. Hope they works for you..!!
Method 1:
Simple way is to turn off the power source.
Method 2: Using JupyterLab Server
If you can connect to JupyterLab Server at http://192.168.55.1:8888/, open the console and run the below commands to shutdown and reboot.
sudo poweroff
sudo rebootMethod 3: Via Remote Desktop
Run the below commands by doing ssh to jetson device through remote desktop
sudo poweroff
sudo reboot