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Connect the pin of the module to the Ring (TX) of the plug.

: If your PC shows a "Code 10" error in Device Manager, you likely have a cable with a counterfeit Prolific chip. Reverting to an older driver (version 3.2.0.0 from 2008) often fixes this.

The most common location is on the front face of the radio, often hidden near the top-left corner. It is frequently all-black and blends in with the chassis.

: Use an RJ-45 microphone pinout only if you are trying to interface with the mic port, which is generally not used for standard frequency programming. Software and Drivers

: 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.

: If CHIRP fails, the official QYT programming software is a reliable alternative, though it may require specific COM port settings (typically COM3 or higher). Troubleshooting Common Issues

If you want to build your own cable rather than purchasing a QYT USB cable , you will need a USB-to-TTL UART module.

Connect the pin of the module to the Tip (RX) of the plug.

The KT-8900 uses a standard Serial-to-TTL (3.3V or 5V) interface. While the port often accepts a 4-contact (TRRS) plug, it typically only uses three contacts: , Transmit (TX) , and Receive (RX) . Plug Contact Description Tip RX Data coming into the radio from the PC Ring 1 TX Data going out of the radio to the PC Sleeve GND Common ground for the circuit

Note: For DIY cables, "TX" on the radio must connect to "RX" on your USB-to-TTL adapter, and vice versa.