Motorola XOOM (WiFi) users are reporting that a mysterious update is being pushed to their device’s today. We received a Phantip from one of our readers letting us know of his Xoom prompting him of the Android 3.2.1 build HTK55D update. While we have yet to see of a changelog from Motorola, according to the boys on XDA this is some kind of bootloader maintenance update so be careful if you’re rooted. If you haven’t yet been notified jump into your Settings > About Tablet > System Updates and it should be waiting for you. Have any of our reader successfully updated? Notice any improvements or any kind of weirdness?