There are three main categories of causes for this error: Hardware faults, Connection configuration errors, and Software/Driver mismatches.
: Open your device manager to confirm the correct COM port is selected in your flashing software (e.g., GXDownloader or STM32CubeProgrammer). Perform a Power Cycle : Disconnect power from the STB. Click "Start" or "Connect" in your software tool . There are three main categories of causes for
on your PC to ensure your USB-to-Serial adapter (often using or PL2303 chips) is recognized and assigned to a COM port. in the software to the STB's default (typically STMicroelectronics Community Recommended Tools for Repair Click "Start" or "Connect" in your software tool
Insufficient power during a boot cycle can occasionally cause the BootROM to hang in this diagnostic state. Potential Solutions Hardware Reset: Unplug the power cable from the STB. Potential Solutions Hardware Reset: Unplug the power cable