In certain cases after the i OS update, the i Phone, i Pad or i Pod Touch could automatically enter Recovery Mode.Recovery Mode is a particular state of i OS devices which have encountered software- or app-related trouble.Apple provides some information about the meaning of i Tunes error messages during upgrade.This article will help you find the steps to resolve most i OS upgrade errors involving i Tunes.Fix for i OS 7.1.2 update freezing issue A hard boot reportedly fixes this for those facing a similar issue, notes i Phone Hacks."I pressed and hold the Home button and the on/off button for a few second then the device shut off.I turned it on again and it booted into the log screen. It says the version is 7.1.2, if i check for update, it says it has the latest version. Thank you for your helps" notes a member, Kenny Liu at Apple Support Community.Updating the firmware on your lock should only take 15-20 minutes.
Restoring from i Cloud backup requires an active connection to the Internet. Also, connect the i Phone to a power source since the restore process can quickly deplete the i Phone battery.
Upgrading from a previous i OS version should go smoothly and in most cases you should have the i Phone data and settings back, directly after updating to i OS 7 or i OS 8.
However, even a well-engineered upgrade can sometimes fail and may lead to data loss.
Those who are having the issue, here is what you do.
Hold the Home and Sleep/Wake buttons for several seconds until the screen goes dark. Release the buttons and wait for the devices to boot into normal mode.