Here’s what went down. Motorola earlier this year decided to join Google’s Android Upgrade Alliance, an initiative unveiled at last year’s Google I/O event in which the search giant said it would work closely with its partners to make sure that Android smartphones and tablets would continue to receive updates for at least 18 months after their release. If you bought a mobile device from one of the members, you knew you were covered for the next year-and-a-half, or so it was supposed to be that way.