Navigate to your car's Settings > Car Infotainment > About Device . Some units require a passcode (like 8878 ) to access hidden developer menus where you can change the default link software from "AutoLink" to "CarLetter".

Since Carletter Cast may be unpublished from the official Play Store at times, users often find the latest version (V3.0.5) on verified APK repositories like APKPure.

Carletter serves as an alternative to "AutoLink" or "PhoneLink," often found on M-Series head units. Its primary benefits include:

The Carletter Android Auto APK (often referred to as ) is a specialized screen-mirroring tool designed to bridge the gap between your smartphone and an aftermarket or factory-installed Android head unit. Unlike the standard Google-made Android Auto app, Carletter focuses on mirroring your entire phone screen, allowing you to use apps that are typically restricted for safety reasons, such as YouTube or Netflix. Core Features of Carletter Cast

Once installed, open the app on your phone and grant permissions for screen casting and Bluetooth.

Allows drivers to view media apps (like YouTube or social media) while the vehicle is parked.

To get Carletter running on your system, you typically need to install the APK on your phone and ensure your car's head unit is configured correctly.