To program the Motorola GM338 mobile radio, you need the Professional Radio CPS (Customer Programming Software)

Motorola typically restricts software access to authorized partners and business account holders.

Modify and Write: Make your frequency changes. Once finished, click "Write Device" to upload the new settings to the GM338. Safety and Best Practices

Motorola GM338 programming software is designed to configure and manage the radio's features, such as channels, frequencies, and tone settings. The official software, typically provided by Motorola Solutions, is not easily accessible to the general public. This limitation has led to the creation of third-party solutions, including exclusive download repacks.