Apple has stopped signing iOS 9.2
for all the iOS devices like iPhone, iPad and iPod Touch which means that users
can no longer downgrade their iOS to that version using iTunes. Now you can’t
downgrade to iOS 9.2 if you are on iOS 9.2.1 and also cannot upgrade to iOS 9.2,
if you are on lower versions. So basically you are forced to upgrade to iOS
9.2.1 directly.
Apple has stopped signing iOS 9.2 for all the iOS devices like iPhone, iPad and iPod Touch which means that users can no longer downgrade their iOS to that version using iTunes.

Apple always gives two versions
of iOS to restore whenever it releases a new version. So that people have ability
to downgrade to the previous version if they are not satisfied with the new
one. But after some time, it stops signing the previous version. iOS 9.2.1 and
iOS 9.2 didn’t have any changes at all in terms of features. Some security
updates were added to iOS 9.2.1 which was a minor update to the iOS.
Note: If you are on lower
versions like 9.1, 9.1.2, 9.2, do not upgrade to iOS 9.2.1 beacause no one
knows for what version of iOS there will be a jailbreak. We all are waiting for
jailbreak to be released. So it’s better to stay on the older version of iOS
for now.