Changes the actual operating system of the radio.

Mercedes-Benz doesn't always release "feature" updates for older systems, but firmware patches are critical for:

Updating this system isn't just about getting "new" features—it’s often about stability and compatibility with modern smartphones. Here is everything you need to know about the latest firmware status for NTG 4.7. Why Update Your NTG 4.7 Firmware?

Some owners use Vediamo or DTS Monaco (specialized engineering software) and a C4/C5 multiplexer to flash the firmware themselves using Telematics discs.

Fixes for "echo" issues during hands-free calls. How to Check Your Current Firmware Version