Flashing GX6605S software over USB is the most common way to update these receivers, and after going through the process multiple times, here’s a realistic look at how smooth (or not) it actually is.
The basic steps are straightforward: format a USB drive to FAT32, copy the correct dump or update file to the root folder, plug it into the receiver, and trigger the update from the menu (or by power-cycling with the USB inserted, depending on the model). Most boards detect the file automatically and show a progress bar during the flash.
What I appreciated was how forgiving the process is when you use the correct file — flashing typically takes two to three minutes with no fuss. What I didn’t appreciate: error messages are often vague, simply showing “update failed” without explaining why, which usually means a mismatched dump file or corrupted download.
A stable power supply during flashing is non-negotiable. Any interruption mid-flash risks bricking the box, and recovery in that case usually requires a programmer tool rather than another USB attempt.
Verdict: USB flashing is simple in practice, but success depends entirely on using the exact, verified dump file for your board.
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