| Error Message | What It Actually Means | The Fix | | :--- | :--- | :--- | | | The software cannot see your cable. | You are on COM3, but the software only searches COM1 or COM2. Use a DOS port redirector (like MODIFY or INTERLNK ) or change your USB adapter to COM1 in Device Manager. | | "Checksum Failed" | The data read from the radio is corrupted. | Bad cable, RF interference (move the antenna away), or 12V power supply ripple. Use a battery. | | "Model Mismatch – Serial Number Differs" | You are trying to clone a different radio's codeplug. | The software protects against cloning. You must manually edit each radio or use a "Cloning" cable (different process). | | "Invalid Frequency Entry" | You entered 155.0000 but the radio expects 155.000. | The software requires exact frequency step increments (5 kHz, 6.25 kHz). Adjust your entry to match the band plan. |
The most reliable method for Windows 10/11 users is running the software within DOSBox configured to host a Windows 3.1 installation. motorola gm950 programming software work
serial1=directserial realport:COM1 (matching your PC's Device Manager setting). 3. Step-by-Step Programming Process | Error Message | What It Actually Means