The is a commercial-grade two-way mobile radio, widely used in taxis, construction, security, and fleet management. To program it (set frequencies, squelch codes, power levels, etc.), you need Motorola’s proprietary Customer Programming Software (CPS) . However, unlike USB radios, the GM3688 uses a legacy serial interface, and Motorola strictly controls software distribution.
Since Motorola has discontinued support for this model, you can find the software through these channels: motorola gm3688 programming software download
There are two legitimate ways to acquire the software: The is a commercial-grade two-way mobile radio, widely
: Most modern USB cables have a built-in "Radio Interface Box" (RIB) converter and do not require a separate external box. Motorola Programming Software CPS Radio - The DXZone widely used in taxis