Alright, I went ahead and flashed both the firmware and MCU, a couple times each to be safe. Unfortunately this has still not fixed the issue and I'm getting more perplexed.
For example when I originally reboot after flashing that firmware Bluetooth doesn't work.
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hmm i’m curious, if you turn up the volume and pull out, reinsert, wiggle around the little aux plug end, do you heat any static at all through the speakers? what if you plug in an aux device and play through the oem radio, does that work?
i’ve encountered having to delete and repair my bluetooth pairing after reinstalling the system software, never the mcu though …never had to play with the sound type setting though
I have to manually go into the Factory Mode > Advanced Settings > Bluetooth > BW-122. After a reboot I can pair again and Android Auto works. I also noticed that voice commands work, so audio is definitely going one way!
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The same thing happens with the sound icon in the top right if I pick something in the advanced settings menu. Still no output.
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I really appreciate your help, unfortunately it looks like I once again tried to fix something that wasn't broke. You'd think that a software dev like myself would have learned that lesson by now.