Update: you can just put an ota zip file with the file i have attached here under the root of a fat32 formatted usb stick. Insert it and the flashing should automatically start when the device has booted up.By flash drive do you mean a classic usb pen? Then just insert the USB key and everything should start automatically, as soon as I turn on the car stereo? And for the root instead, how can I install it? Thanks again for the answer!
I don't know if you can just put an android 9.1 go ota update within a android 8.1 go installation.
Root: You first need twrp installed. Download an ota file for your device and extract it into a folder. Then replace the recovery.img with the twrp one(recovery.img attached to this message). Then usb zipbuilder to zip the folder to a zip file. Put the zip file under the root of the fat32 formatted usb stick together with the xyauto_bin file and install it in the device. You know have twrp installed on your device.
Now install terminal emulaator under android and run it. Type 'reboot recovery' to reboot to twrp recovery. In twrp recovery, you can just install the magisk zip file. Then install magisk manager apk. You should now have a rooted device.
btw, i used this switch for turning the radio on and off. Otherways the radio would drain the car battery when in standby.
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