My iPhone 5 can not update and installing ios 9.3

Did you trey to connect to iTunes on your computer and follow the steps mentioned in this article?

Restoring to factory settings will download the newest firmware, after that restore from the latest backup you made before you started this update process.

About backups in iCloud and iTunes - Apple Support

Use iTunes to restore your iOS device to factory settings - Apple Support

Thanks for this response. I have the same problem. IOS 9.3.1 is downloaded to my iPhone 5S but it won't install. The error keeps saying I am not connected to the Internet but I am connected to the Internet. I also tried to update on iTunes but it says my software is up to date (but I still have 9.2 on it). If I don't do anything, is it possible that Apple will fix the problem in a future update so I don't have to spend time on this workaround?

Did you also update iTunes to the latest version?

Apple has pulled the iOS 9.3 update for some devices (iPad Airs and previous, iPhone 5s and previous) due to problems with Activation. You will not be able to update until a fix is issued.

See this article for details.

http://www.imore.com/apple-working-ios-93-fix-older-iphone-ipad

A new build for the iPad 2 is now available that does not require the Activation step. A new build for the other devices is not yet available.

Hi

Wait for a fix from apple a few days or hours .

Cheers

Brian

AAwesome! Thanks. I will wait it out...