this post was submitted on 07 Nov 2023
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Google Pixel
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It's not impossible. The update isn't set in stone until you reboot into the Android UI. Prior to reboot it can be discarded trivially. Post reboot but prior to starting up the Android UI, it can be rolled back.
yes would be easy for them to do, I just don't think I've seen Google do this before
It would be interesting to see if it's an actual cloud-controlled recall feature or whether it's something simpler like timed expiry of an installed but not activated update. Haven't dug into update_engine for that. Could also be in the upper updater layer, outside of update_engine.
At least on Chrome OS, update engine does have a recall feature. The server can say, "if you've downloaded and installed an update and you're waiting to boot into it, cancel it and stick with what you have"