This app could inject your Switch bin by using USB cable with your Android Mobile.
Note:
The Injection need a OTG cable to connect your phone and NS so you have to buy a correct one
The app doesn`t include bin file please find it by yourself and put it in your storage
The injection might fail if the cable or phone don`t support the injection. Change another mobile phone or cable might fix this problem but the app cannot do any fix right now.

You also could give a star or report an issue in the github page:
https://github.com/huhao1987/NXloaderRB
Cheers.