This is somewhat rare, but if an i OS update is interrupted it can happen, which usually requires a device be placed into DFU mode and restored manually with firmware.
Typically a normal i Tunes based restore is sufficient, which is why that is fairly rare.
Not all versions of i OS IPSW will work on all devices, so be sure to select the proper version for your hardware, and to use the latest which is supported.
October 2016 with a step-by-step video]Contrary to popular belief and contrary to my earlier version of this article, you CAN restrict i Message on an i Pod touch or i Pad.
A significant advantage to using firmware files can be found for users with limited access to broadband internet, where downloading a software update on a remote faster connection makes more sense.
Typically you would then copy that IPSW file to a USB key or DVD to bring it home to manually update a device.
Setting parental controls for i Message is a 2-step process: General and select Restrictions. It seems like they’ll be able to enter their Apple ID to get back in, but those options are actually greyed out and you can’t type into those boxes, which is hard to tell from this screenshot.
Safari will then launch the appropriate application to handle it.mailto://EMAIL_ADDRESS will launch the mail program to compose a message to EMAIL_ADDRESS.On the i Phone you can enter special phone numbers to access special features or information.Finally, there are some cases where IPSW is necessary to create custom configured firmware for future restores.This typically ties in with the “Restore” method of updating, which allows the use of custom IPSW files, and is generally something created with a third party application like Pwnage Tool or sn0wbreeze.