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: Ensure the 3.5mm plug is pushed all the way in. The recessed nature of the jack sometimes prevents standard bulky plugs from seating correctly.
Connect the pin of the module to the Ring (TX) of the plug. qyt kt8900 programming cable pinout top
: Ensure you install the correct drivers for your USB chip. If using a CP2102, Windows usually handles this automatically. For CH340 chips, you may need a separate download. : Ensure the 3
: Use a module with an FTDI or CP2102 chip. Avoid older Prolific (PL2303) chips, as they often have driver issues on Windows 11. Solder the Connections : qyt kt8900 programming cable pinout top
Connect the pin of the module to the Tip (RX) of the plug.