Apple has just stopped signing iOS 9.2, meaning you will be unable to downgrade on these devices any longer.
iOS 9.2 (13C75) is no longer being signed for iPad 2 (CDMA), iPad 2 (GSM), iPad 2 (WiFi), iPad 3 (CDMA), iPad 3 (GSM), and iPhone 4
If you have another device not listed and want to downgrade do it immediately.
iOS 9.2 (13C75) is no longer being signed for iPad 2 (CDMA), iPad 2 (GSM), iPad 2 (WiFi), iPad 3 (CDMA), iPad 3 (GSM), and iPhone 4
If you have another device not listed and want to downgrade do it immediately.