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Lesson of the day, do not flash back to Pie on a pixel 3a that is on q

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FWIW, I flashed back to Pie from Q on a Pixel 3a XL and didn't have any issues. Not the same device, of course.

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i flashed wrong device firmware, some how it actually booted

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No real difference between the bonito / sargo firmware, boot or vendor images and system image differences are minimal. gist.github.com/thestinger/9dc Pixel 3 and Pixel 3 XL are similar, but they use different touchscreen drivers so they load a different module. They ship both anyway.

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11:04 PM · Jul 5, 2019Twitter Web Client

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Well installing XL firmware on a normal one, results in a funky touchscreen experience lol

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It might just be from not having the resources for the appropriate size. I'm not entirely sure. I assume that a generic system image ships every size of resource to deal with that. It will also mess up the brightness curve and the initial power usage estimation, etc. too.

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i.e. the Pixel 3 touchscreen driver is shipped in the Pixel 3 XL vendor image and vice versa, and I doubt there are any actual differences / incompatibilities between those. They could easily eliminate the remaining differences by handling it at runtime and use the same releases.