If you are trying to "revive" or upgrade a decoder (like a Gsky V8 or similar GX-based chipsets), follow these steps to resolve the UART communication issue: Check Physical Connections Ensure you are using a null-modem (cross-line)
plug in or switch on the STB. This allows the tool to catch the "bootrom" signal the moment the chip receives power. 5. Check Physical Pinout Bootrom Error Wait For Get Please Check Stb Uart Receive