| Error Message | Probable Cause | Solution | | :--- | :--- | :--- | | | Wrong COM port selected in CPS. | Go to Device Manager, note the COM number, change it in the software. | | "Check connection" | Radio is off or cable is loose. | Wiggle the cable. Ensure radio is powered ON. Turn volume down to 2/10. | | "Unknown Device" (Yellow flag) | Windows driver signature error. | Use Driver Signature Enforcement Override (Google: "Windows 10 unsigned driver install"). | | "Frequency out of range" | You typed a frequency the Chinese chip doesn't support. | Ensure frequency is between 400-520MHz. | | Software won't launch | Missing Visual C++ or VB6 Runtime. | Install "Visual Basic 6.0 Runtime Plus" from Microsoft. |