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Measure UART RX pin voltage with a multimeter: Bootrom Error Wait For Get Please Check Stb Uart Receive
Insert a non-conductive tool, such as a wooden toothpick or a plastic pin, into the AV jack until you feel a soft click. Press and hold that internal button down firmly. This public link is valid for 7 days
Follow these sequential steps to resolve the serial connection failure. Bootrom Error Wait For Get Please Check Stb Uart Receive