If the software can't find the radio, check your PC's to ensure the cable is assigned to the correct COM port (e.g., COM 3 or COM 6). OS Compatibility: While modern versions of
| Problem | Likely Cause | Solution | |---------|--------------|----------| | “Radio not found” / Timeout | Cable not fully inserted | Push cable into speaker/mic jack until click is felt | | COM port missing | Driver not installed | Reinstall CP210x driver; try different USB port | | Read/write aborts at 80% | Low radio battery | Use external power or fully charged battery | | Password prompt appears | Radio is read-protected | Enter dealer password (cannot be bypassed without master reset tool) | | Checksum error after write | Corrupted codeplug | Read radio again, re-edit, and rewrite | | Digital channels no audio | RAN code mismatch | Set same RAN on TX and RX, or disable RAN on receive | icom ic-f4003 programming software