Apple sends out revised iOS 9.3 update for those with older iPhones and iPads
Still, that means that there was a possibility that one's iPhone or iPad could end up as an expensive ornament on a desk. So Apple has developed a new version of the iOS 9.3 update that includes the necessary fix that will prevent affected devices from getting caught in an activation loop. The new version of the update does not require the iOS device owner to type in their password to download and install it. Affected devices include the Apple iPhone 5s and the Apple iPad Air 2 and older.
If you already have installed iOS 9.3 in an older iPhone or iPad, you need to sync the device with your PC, go to iTunes and install version 13E236 of the update. On the other hand, if you have one of the older devices and have yet to install the OTA version of the update, you can now do so without fear of bricking your phone or tablet.