What you want to ask is how to download the built-in menu of mountaineering racing. Details are as follows:

1. Open the car audio system and enter the main interface.

2. Find the "Settings" or "Menu" option and enter the settings menu.

3. Find the option of "Built-in Menu" or "Advanced Settings" in the setting menu and enter the built-in menu.

4. Make settings as needed, such as adjusting the volume, adjusting the sound quality and setting the broadcast channel.

5. After setting, save and exit the built-in menu.