For the longest time, we've suspected that Android's "Check for update" does nothing to actually get you the update. If you were in the group that is supposed to receive the update, the button simply sped up the process instead of waiting for the next automatic check to reveal it, but if there was an update and you weren't in the group, it did nothing to push you forward in the waiting line. Then in September, we were promised that manually pushing the button on Nexus and Pixel devices will get you an available update even when a passive background check wouldn't, and it worked momentarily.

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