If you must use a modern Windows 10/11 PC, use DOSBox, an x86 emulator.
Crucially, the GM950 draws its power for programming from the radio itself. This means the radio must be connected to a 12-volt power supply (or a vehicle battery) during the process. The scene was often chaotic: a radio sitting on a workbench, connected to a car battery charger, connected to a RIB, connected by a fraying serial cable to a laptop balancing on a stack of manuals.
Technically, Motorola released a (Plus) version later that works with Commercial Series CPS – a Windows-based graphical program (similar to the software for the CM/PM400 radios). If you have a GM950+ (look for the "+" on the badge), you can use a modern Windows 10/11 PC with a USB cable. However, for the standard GM950, you are stuck with DOS RSS.
If you have spent hours debugging serial ports, consider these options:
Once your hardware is linked, follow these steps to update your radio:

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