Apple released iOS 8.3 just under a month ago and now the company has stopped signing code for iOS 8.2, which means you will not be able to downgrade from 8.3.
You can now no longer downgrade from iOS 8.3 to iOS 8.2 through iTunes, and if you have a jailbroken device you need to avoid the update to 8.3 as this cant be undone.
Apple’s iOS 8.3 comes with a wide range of new features, which includes support for the new Apple Watch and also the company’s CarPlay.
The next version is already available in beta, iOS 8.4, as yet there are no details on when Apple will be releasing the new version of iOS for the iPhone, iPad and iPod Touch, as soon as we get some more details, we will let you guys know.
Source Apple Insider