Disconnect the STB completely from your computer and power outlet.
This error typically appears when trying to with a device (e.g., set-top box, router, embedded Linux board) over UART (serial interface). It indicates that the bootROM on the device’s SoC is waiting for a specific handshake or command from the host PC, but it’s not receiving anything valid on the UART receive line. Bootrom Error Wait For Get Please Check Stb Uart Receive