You can't program a CM340 via USB or Bluetooth. You need a specific hardware chain:
The CM340 supports basic signaling like MDC1200. You can set PTT IDs here so other operators know who is talking. 4. Write to Radio
Before making any changes, always "Read" the current codeplug from the radio. Save this as a backup file. If you make a mistake, you can always flash the original settings back. 2. Configure Frequencies motorola cm340 programming software exclusive
Click the "Write" icon. Do disconnect the cable or turn off the radio during this process. A progress bar will appear, and the radio will usually beep and restart once the "exclusive" configuration is applied. Troubleshooting Common Issues
While the original software was designed for older versions of Windows (XP/7), many modern versions can run on Windows 10 or 11 using "Compatibility Mode." You can't program a CM340 via USB or Bluetooth
If using a USB-to-Serial cable, ensure you have the latest Prolific or FTDI drivers installed to prevent communication errors. Step-by-Step Programming Basics
Once you have secured the software and cable, follow these steps: 1. Read the Radio If you make a mistake, you can always
Usually caused by the wrong COM port selection in the software settings. Check your Device Manager to see which port your USB cable is assigned to.