If you own a GX6605S-based receiver and have serial access, keep this tool on a Windows laptop. It’s ugly, manual, and slow, but it works reliably for the critical tasks it was designed for – especially recovering a dead bootloader.
Changing hardware IDs to allow custom firmware compatibility. Essential Requirements
Flashing via this tool is often cited as being faster than using external hardware programmers like the CH341A USB Flasher . Typical Usage Requirements
Many GX6605S boxes are locked to specific satellite or terrestrial parameters. Advanced users use GXDownloader to flash unlocked or customized firmware (e.g., for adding BISS keys, changing channel lists, or enabling disabled features).
Change the COM port number inside the application or restart your PC to free up the interface. "Found Serial Port, Waiting for Board Reset..." (Stuck)
In this context:
: Click "Start" in the software and then turn on the receiver's power. The progress bar should indicate the data transfer.
The COM port number in Windows Device Manager must match the setting in GXDownloader. Risk Warning
: Ensure TX (Transmit) on the PC connects to RX (Receive) on the receiver, RX to TX , and GND (Ground) to GND . Step-by-Step Firmware Flashing Guide
"Found serial port, waiting for hit any key to stop autoboot" (Hang State)