Reset the NANOPPI R5S Router Password?

I bought from Youyeetoo NanoPi R5S with FriendlyWRT installed and changed the root password some time ago. but I can’t find the password and I need to recover. how can I do that ? couldn’t find a guide online. Thank you

If you are using a friendlywrt system, refer to the following article, otherwise you may need to reflash your system.