If you can tell me your or if you're getting a specific error code (like "Couldn't open port"), I can help you troubleshoot the connection!
The GM338 was a versatile radio that offered advanced features, such as 800/900 MHz operation, 30 channels, and a power output of up to 45 watts. However, to fully utilize its capabilities, users needed to program the radio with specific settings and configurations. This is where the Motorola GM338 programming software came into play.
The Motorola GM338 belongs to the (formerly known as the Radius series).