PWM to control HAT-MDD10 with jetson nano

For any pin change we would suggest re-flash the system, so that the pin is well set from bootloader, kernel, to userspace. Please check Jetson Nano FAQ

Q: Why pinmux setting does not work on some pins?

Without re-flashing, you an try to run a script at startup to execute the commands. Please refer to

Q: How to autorun an app or commands at startup?