| Error Message | Cause | Solution | |---|---|---| | “Communication with radio failed” | Wrong COM port or driver issue | Check Device Manager. Change COM port number to COM1-COM4 manually in advanced settings. | | “Codeplug version mismatch” | Radio firmware newer than CPS R02.06 | You need a newer CPS (if available) or downgrade radio firmware (not recommended for beginners). | | “Unable to open USB port” | Another program holds the COM port | Close all other radio software (e.g., ProGrammer, other CPS). Reboot. | | “Checksum error after write” | Corrupted codeplug or low radio battery | Replace radio battery fully. Read radio again, save as new file, then write. | | Crashes on Windows 10/11 | Incompatibility with modern OS | Run CPS in Windows 7 compatibility mode. Right-click .exe → Properties → Compatibility → Run program as Windows 7. |
You must register for a business account to purchase or download the RVN5194 files. motorola rvn5194 cp185 cps r02.06 programming software
Some resellers still offer old stock of the Motorola programming CDs. These come with a license key. Ensure the CD explicitly says “RVN5194 CP185 CPS.” | Error Message | Cause | Solution |