Additionally, some notable security updates are included in the i OS 8.4.1 release, making it a recommended update for users.
i OS devices require at least 550MB of free space available to install the small software update.
Restarting an i Phone, i Pad, or i Pod touch is just a matter of Holding down the Power button and Home button simultaneously until the device restarts.
Technically, that approach is called a Hard Reboot because it forcibly restarts the i OS device, but in situations where things are acting up, crashing, or just not behaving properly, it’s usually more effective to force reboot than to use the standard power-off approach.
Also, try using a different USB cable entirely, whether it’s another Lightning cable or the old-fashioned 30-pin adapters.