I'm not sure if I've got the same system as you - mine is from Naviplus in Australia and it uses an overlay screen over the OEM display. I use Android solely, but I don't have a "dongle" with a light on in my set-up. There is a box that the USB cable plugs into, and this is tucked up behind the trim covering the transmission tunnel on the passenger side. It's quite simple to access. My understanding is that it is this box that is the brains of the system, and if anything needed to be updated it would be this box - so no need to tear the dash apart.
Having said all of that, mine is working just fine. My phone is an A52 and it's running the latest version of Android that was released for this phone by Samsung - no idea what version that actually is.