Nvidia has started pushing out a new update to its Shield and Shield K1 tablets. Listed as 'software upgrade 5.1', the update brings along some fixes and improvements - no new features are included. Specifically, the official change-log reveals that the update fixes the issue that causes the mouse cursor to intermittently appear during keyboard input. In addition, Launcher3-related crashes have also been fixed. And finally, some system stability improvements are included as well. Source 1 2 | Via
Source: http://www.gsmarena.com/new_update_hitting_nvidia_shield_and_shield_k1_tablets-news-23832.php