It's possible that Apple is trying to provide critical security updates to older devices dropped by newer i OS updates, something it also does for older OS X versions for a while after they're superseded by newer software.
The next major i OS 7 update is i OS 7.1, currently in its fifth developer beta.
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Here I will explain solution to this problem and details about DFU and Recovery Mode.Best solution will be, put your i Phone into DFU Mode(Device Firmware Update mode). Putting i Phone into DFU mode might be pain in ass, but it not so tough just follow the process few times if you can't reach in DFU.The update to i OS 6 is marginally more interesting than the i OS 7 update, just because Apple has so rarely patched old i OS versions after they've been replaced.The company also released version 6.1.5 for the fourth-generation i Pod touch to correct a Face Time connectivity issue.Here to remember DFU mode and recovery mode is different. Recovery Mode : Recovery Mode is a state of i Boot used during standard upgrades and restores.
As i Boot is active, it does not allow you to downgrade your device’s software.
Current rumors suggest it will be released to the public in early or mid-March, and it should include more significant fixes than the six minor updates we've seen since September.
Update: The full description for the update has gone live on Apple's site.
Also, unless it is ‘pwned,’ it will not allow custom firmware to be flashed. Without releasing power button hold Home button too(use another hand may be) Keep both button pressed for 10sec(exactly).5.
DFU Mode : DFU Mode is a special mode where the device can still interface with i Tunes, yet it does not load the i Boot. Release power but keep holding home until the computers beeps (observed on a PC) as a USB device is recognized.6.
i Tunes can be the most useful tool for i Phone users, however, the more it is been used the more errors will be find.