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Technically it would be possible. Yes, part of the existing UI can easily be turned into a browser that navigates to a desired page, so doing UI via a web...
Do you mean to say you got root on your suzuki head unit? Could you provide more details? Or is it just very similar system that's used ?
I don't know the exact bt IC but it's definitely older than BLE. It'll be a while before i can actually hook up to it and check the exact hardware...
I can't make videos on this, but I'd be happy to help answer any questions you might have.
You don't need to access tx/rx pins or UART at all. That was only for my initial research. Using what i've documented, you can enable SSH on the head unit...