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I believe fduniho is correct in that this is a pointless exercise. You are really asking for trouble and even "upgrading" Android from 6.1 to 8.1 is for most people stressful and not worth doing. My smart phone is now on Android 11. It took Boyue forever to work out how to upgrade to 8.1 and put the instruction on the web. They had to do it because they made the promise but it's unlikely they will go beyond 8.1. 6.1 does the job adequately for many users.
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