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I misread what you're looking for.
basically, to accomplish what you're looking for, you need to root your device, and then flash a custom rom that is compatible with said device. there's not a raw official android rom per se, but there are many many custom forks of the Open android version that you can look at
process is different for every device, and sometimes for every version of the android based rom you might want to look at.
xda is probably your best resource for this
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