Hi, this is my pain as well.
You are lucky because the method does not work with firmware of the head unit 850 in Suzuki SX4 Scross 2017.
I was able to get the full screen of the phone and run any app only once when the Car mode on my S8 crashed and disappeared. Unfortunately neither Button Savior nor Easy Touch are not able to kill the task of Car mode even somehow I was managed to get the android settings and puss the Force stop button of Car mode.
Unfortunately I did not remember where but I found a post deals with the handbrake issue.
Here is the translated test which may help you out.
"Have been found on the connection to the Bosch radio / navigation unit.
It is the light blue wire that sits on the white connector with three wires: purple, orange and blue. This blue thread pause and then make a connection to ground the piece still remains on the connector. The other hand, to isolate with a piece of insulating tape, and let go.
Now Mirror Link also works if the handbrake is not engaged!"
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