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If you have acquired a used GM338, you cannot program it with the modern for the XPR or APX series. You need the legacy software: Motorola Radio Service Software (RSS) or the later Professional Radio CPS . motorola gm338 programming software download upd link
The Motorola GM338 is a legendary commercial-grade mobile radio. Known for its rugged build, clear audio, and reliable performance in the VHF (136-174 MHz) and UHF (403-470 MHz) bands, it remains a staple for off-roaders, truckers, and public safety volunteers. However, as this radio is discontinued, programming it has become a significant challenge for new users. Did this guide help you