Radius Gm300 Radio Doctor Free ((link)): Motorola
Disclaimer: Modifying radio software may violate FCC regulations (Part 90/95) regarding certified transmitters. This guide is for educational purposes for amateur radio operators (Part 97) who are legally allowed to modify their equipment.
Read community reviews and user experiences with GM300 programming on Are you planning to use a native COM port USB-to-Serial adapter for your programming setup? Motorola GM300 | RadioReference.com Forums motorola radius gm300 radio doctor free