2018 OS boots on 2015 hardware, with working sound...but missing
CarPlay and doesn’t seem to detect the USB correctly. If the system is booted with usb plugged in, it will detect and use that device until unplugged.
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Quantum Logic "On-Stage" works, but "Audience Mode" does not seem to change anything (from the current setting). ClariFi might be shaping the audio just a little, but if it's actually working I can't really tell.
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My 2015 navigation card also does not work.
Here's the 2015 image:
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Here's the 2018 image (again):
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I think I've struck gold, but I'm not sure how to use it:
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2015 (not 2018)/3.2GB/usr/src/debug has the entire development source code for every app in the system- including the upgrade interface, should anyone be interested in piping in new features. 2018 has
Carplay source code.
2015-18/1.6GB/root/boot is where we load the system configurations.
EDIT: Have been pulling my hair out for 2 hours trying to figure out why I didn't have any free space left in some partitions after deleting some files. Ubuntu in all its wisdom decided that if I don't shift-delete, it's going to stick the deleted files in a .Trashes hidden folder with root-only visibility permissions. And then not actually link the trashed files to the trash.
Resizing partitions results in shenanigans and random errors. Apparently these partitions are very carefully sized. Restoring the backup image
Any modification to the 214mb Boot partition causes failure to boot. Who knew? Restoring the backup image
Splicing files directly doesn't work, unless I'm missing some lib dependency somewhere. I suspect the app was compiled in a specific way for the newer headunit. Restoring the backup image