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Do you have CIC or NBT based headunit?
My 2013 535i came with 6.5 inch screen. The software in my headunit has the CIC user interface. The Bimmercode app says my headunit type is CHAMP2. It also identifies the headunit as HU_CICHB.
Even though my headunit has CIC user interface, my 6.5 inch screen still used a NBT (6 pin) LVDS cable to connect to the headunit. I verified this by looking at both the cable and connector.
Bimmercode didn't give the option to code a different resolution on my CIC based headunit unit. And Ive read that it's because only the NBT based headunits allow you to code a different resolution to be sent to the screen.
Put differently, even if you have a screen that uses NBT connection to the headunit, you still need the headunit itself to be NBT in order to have access to the option to code the resolution that the headunit sends to the screen. A CIC unit apparently might not give the option to select a different resolution. This is just what I've read. I'm no expert on this.
If all this stuff is true about not being able to change redolution on CIC headunits, then that could be why the 10.25 in Android replacement screens offer the split screen display option. So that the 6.5 in CIC folks who can't code their headunits to support a different resolution, don't end up with just a wider screen that tries to fill up it's available widescreen real estate by simply stretching the lower resolution that its getting from the headunit. Instead, the lower resolution can remain unstretched by occupying only part of the wider screen. While the other unoccupied part of the wider screen is filled with a widget graphic that shows some information that's placed there by the Android unit itself (fuel level and speed).
Again, I'm no expert on this. But what I said about my car's particular setup is accurate because I checked it myself before ordering my Android replacement screen which now uses the 6 pin NBT cable to connect to my CIC based headunit.
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