1. Hold down the power/antelope button/top button on the right side of the screen (depends on the device).

2. While holding it down unplug and plug back in the power cable (don't let go of the button while plugging back in the power cable).

3. Loader - Golden Boot should be displayed on the screen of the device.

4. Open the launcher and reinstall the firmware (if there is no version in the drop down menu, uncheck the "Newer versions only" option and select the top one from the list and proceed with the update).