timbus

Hey guys, new Lexus NX300h owner. Been lurking the forum, lots of good info here!

Anyway, loving the car, but the nav/media software definitely leaves some things to be desired. I'm a software engineer by trade, and the hacker in me wants to figure out a way to get at the firmware and do some bit twiddling. Things like the nav/dvd-in-motion bypass or android auto/carplay integration seems like they should really be software mods as opposed to hardware boxes. So, thoughts:

1. First step has to be download/upload of the code and decrypting/decompression. Has anybody tried this before? Some quick googling hasn't turned anything up... seems weird.
2. Has anybody figured out a way to download the firmware installed in your car onto a thumb drive or over bluetooth? If not, is there an up-to-date image of a recent firmware floating around anywhere?
3. If anybody's looked at the firmware files, are they compressed or encrypted in any way? Or is it just raw code?
4. Since modern Lexuses can take over-the-air updates using your phone, clearly there could be a way to spoof an update request and upload whatever you want into the car. Has anybody tried to capture bluetooth traffic and see how the update process happens?

Cheers,
-Tim