Make sure you have Python installed.
Drag a picture file with the dimensions 1280x720 onto the py file and a splash.bin will be created in the same directory. Put it in your ReiNX folder to make it your splash screen.
Drag a picture file with the dimensions 1280x720 onto the py file and a splash.bin will be created in the same directory. Put it in your ReiNX folder to make it your splash screen.