[FYT Android Head Units] mastrv:
I'm not sure these are completely correct and if I've understood the translations through Google translate:

1) I'm not sure if it's for the start & stop function. However, it could also reflect "brake wire for video in motion". What this interpretation controls whether or not to display video based on whether the head unit determines that the parking brake is set. There is a wire that can be connected for this purpose. Usually, the car has a wire for this function. You would need to know which wire it is or find out yourself. If this wire is not connected on the head unit, then this setting has no effect. I don't have this, but I think that when it is connected, you cannot play any video on the head unit when the car is in motion.

2) Backlight control. This controls when/how the screen brightness is controlled. "controllo ora" means it's controlled by time, I believe. There is probably an option to have it controlled by the "illum" wire. This is attached to the correct wire from your car. You would need to find out which wire on your car provides this. This wire on your car provides power when the headlights are turned on. I believe this is 12V. Note that this uses the brightness set elsewhere in the settings. This other setting specifies the brightness for during the day and the brightness for during the night. This other setting must be set properly to see the difference. For example, if both the daytime and nighttime brightness are the same, you will not see any difference. So, when set to illum, when you turn on your headlights, the screen dims so that it is not as bright at night.

3) GPS mix. I believe this is used to specify which satellites to use for GPS. I believe this should usually or always be ON.

4) I can't see the entire text, but I believe it is for "interference". I believe this setting is used if there are issues with remote control door locks. If you are having problems with unlocking door with a remote, you can try changing this setting. I'm not too sure about this as I don't have a problem unlocking my doors.

5) "Reverse power supply". There are 2 wires where power is provided to the head unit...a 12V constant power and a 12V switched power where power is available when the car is in Accessory (ACC) mode only. Usually, 12V constant is indicated by a red wire. However, for these head units, 12V constant is the yellow wire and the ACC is the red wire. I believe this is used to switch the usage of these wires so that now the 12V is the red wire and ACC is the yellow wire. The wires on the back of the head unit should be clearly labelled. I believe this option was added so that if a head unit was wired incorrectly, this can be switched without having to take the head unit out and rewire it. Best thing to do is to test your head unit on your test bench, or kitchen table, before installing it in your car. I did not have to use this as I wired it as labeled so I know of this only from reading this information elsewhere.

NOTE: As always, this is only information and you should verify and/or test this yourself. Anything you do with your head unit is your own responsibility and only your responsibility. If you are unsure of things or are not willing to test before trying these things, you should probably have your head unit installed by a professional.