Unlike modern radios that use a simple USB cable, the GM338 utilizes a proprietary Motorola data protocol.
Download CPS R06.12.05 + FTDI USB cable. Read existing codeplug twice before attempting to write. motorola gm338 programming software free best
Avoid shady "download now" buttons that install malware. The safest sources are user-submitted file sections on trusted forums. Search for "Motorola CPS R06.12.00 download" on reputable ham radio forums. Look for ZIP files containing an installer ( Setup.exe ) or a folder with a .msi file. Unlike modern radios that use a simple USB
: The Motorola Professional Radio CPS (frequently version R06.12.05 or similar). This software allows you to adjust a wide array of settings, including channels, zone settings, and scan functions. and scan functions.