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A/B partition

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Nov 10, 2010
I have a question from noob, I have not yet understood the ab partitions, in the sense, when I flash an update or a custom rom via twrp or adb sideload the update goes directly to the active partition as well as the various firmware, instead if I download it on the mobile installs it on the inactive partition and then reboots on it. But the next update will update the other partition which is still behind an update so how do incremental updates work? Do they always have the previous one inside?

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