Jetson Nano - Reinstall

Hi to all,
I would like to reinstall (reset) the Jetson Nano. Does someone can give a hand on that basic subject ?
Thank you for your help

Hi Peter Pan, please re-flash your SD card with the original image using Etcher tool or similar:

https://developer.nvidia.com/embedded/learn/get-started-jetson-nano-devkit#write

Thank you very much :)