Troubleshooting - VTX Setting Can't Be Saved?

Question: For some reason whenever I turn off and turn back on the quad VTX resets to 25mw even if I save the setting.

Solution: The button and SmartAudio cannot be used at the same time. 

You can either change the VTX setting by button or SmartAudio.

Solution A：If you only use the button, you can find SmartAudio on the Ports page and set it to Disabled.

Solution B: If you only use the SmartAudio, you can find more details here to know how to do this.