If you are running v0.9.3 or v0.9.4, you will NEED to perform an ESP32 Sketch Data Upload to wipe SPIFFS
The JSON settings file has been changed and it causes heap issues if you don't wipe the v0.9.4 one out of SPIFFS.
Follow these instructions for installing the ESP32 SPIFFS tool, then run the sketch data upload from the esp32_marauder project in the Arduino IDE.
You will know if you need to do this workaround if your Marauder does the title screen, start-up log screen with the blue text, then just keeps going back to the title screen.
- Settings actually work
For update instructions, see Updating Firmware