I have never looked into saving the settings and don't understand everything straight away.
Good luck!
Yes, I've already looked at all of that code. That code does a complete save of all the settings even if only one thing was changed.
It shouldn't be anymore than just a few lines of code to send a button click to the ESP32 to say update the core voltage from the drop-down list and do nothing else.
Anyway, thanks for getting back to me so quickly, I appreciate it.