Before downloading anything, you need to understand the two types of software Motorola used historically.
When searching for the best free software, you are specifically looking for Motorola GM338 CPS, typically version R06.12.00 or thereabouts.
Do not start building a codeplug from scratch. Ever. motorola gm338 programming software free best
You can find old serial RIB boxes on eBay. They are bulletproof but require a computer with a physical COM port (rare today) or a USB-to-Serial adapter.
Pro Tip: Buy a USB cable that specifically lists compatibility with the GM338, CDM750, or PM400. These use the same bus. Before downloading anything, you need to understand the
To successfully program a Motorola GM338, the following specific technical environment is required:
Motorola offers a free Demo version of the CPS. When searching for the best free software ,
| User Type | Recommendation | Verdict | | :--- | :--- | :--- | | Hobbyist / Ham Radio Operator | Use legacy CPS R06.12.05 from a trusted forum. | Best Free Option | | Commercial / Public Safety | Purchase official Motorola CPS ($199+) or hire a dealer. | Not recommended to use free version. | | Beginner without RIB cable | Buy a $25 "GM338 programming kit" (cable + CD). The CD contains cracked CPS. | Acceptable risk. |
This is the version everyone wants. It runs natively on Windows 10 and 11 (with a few tweaks) and supports the GM338, GM3188, GM398, and PM400.