HI, Sorry I'M french and I don't speak well english

so Someone sold me a ronin m but He don't remember his password and he ahve not his mail adress
So I cant use dji assistant, I just want to do auto tune stability. So how can I do without password and without acount?
Thaks!

Hi, we're sorry for the inconvenience that it caused. The Ronin-M Assistant Software v2.5 can be used using your DJI account. It's not necessary to use the previous account's owner to reset the password of your Ronin M for as long as we have a DJI Account. Once you've connected your Ronin M, you may follow the instruction using the image below. In addition, you may download the Ronin-M Assistant Software v2.5 for you to download the application. Please let us know if you have further concerns.
https://www.dji.com/ronin-m/info#downloads