FeelTech/FeelElec FY8300S Quick Tear Down

[shadowless]

I am not sure why the image on the display on mine was inverted after I did a factory default reset. Does anyone have any idea how to invert the image back?

[Serhii74]

1. In the shutdown state, simultaneously press the power supply and left or right buttons to turn on the power from the rear power supply, then turn it off, pause for a while, and then turn it on again
2. If it has not been adjusted, switch to another button (left or right button