The CAN-BUS decoder is what allows your car to talk to the tablet. If your steering wheel controls aren't working or the dashboard display isn't showing track info, a firmware update with the correct CAN-CODE is often the solution.
If you own a modern Android car head unit, you’ve likely seen the Ac8257 Firmware WORK
Versions like 1.73 are frequently cited by users as highly stable, allowing the unit to "just work" for daily tasks without significant drama. Everything You Need to Know About AC8257 Firmware: