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My LCD / Screen is Flipping, what is the reason?

This is because your RetroStone is out of battery.

When battery is getting low, the LED2 will turn on (see here LED status), then the LCD will start to go crazy (flip/blink …) then the RetroStone will shutdown.

So to solve this issue you just have to charge the battery! (note that you need a 5V 1.5A+ charger)