Apple has released iOS 9.2.1 for the iPad, iPhone and iPod Touch, and with it comes a roster of bug fixes, some improvements, and a fix for the MDM server problem. Those with one of the aforementioned Apple devices can head into Settings and grab the update, but don’t expect anything substantial…those big changes will be coming with iOS 9.3.

The total update is a little under 38MB, and it features some security improvements and bug fixes. Apple points toward a fix for the problem “that could prevent the completion of app installation when using the MDM server” as chief among the tweaks. That was the extent of the specific update details, though.
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https://www.slashgear.com/ios-9-2-1-update-arrives-with-security-and-bug-fixes-19423668/