While updating iphone i unplugged it
Most of the errors can be found at Apple's Knowledge Base. Some have seen success afterwards by doing the downgrade from DFU mode instead of the normal Recovery mode. This is caused by a failure to match the Baseband Nonce currently in memory to the nonce returned in the Baseband Firmware SHSH blob.Here is a list of i Tunes errors that could appear during a restore or a USB connection via i Tunes: This error happens if you are logged out, try to download something from the i Tunes Store and if you click on "Download" and enter an account, which doesn't have this article, this error will occur. This happens if you edited the hosts file (Saurik's Server) or you are using Tiny Umbrella.
The App you've tried to download in i Tunes couldn't be saved. Use Tiny Umbrella or redsn0w to kick it out of Recovery Mode.Unknown error; try again A security software you have installed may be conflicting with i Tunes. If you are restoring to an Apple TV (3rd generation), i Pad 2 (or newer), i Phone 4S (or newer), or i Pod touch (5th generation) or newer, there is no (publicly disclosed) bootrom exploit to restore to older versions of i OS.You're trying to access a section or a functionality that is not available in your country, for example i Cloud in some countries. This happened on a Mac with Tiny Umbrella running before restoring a firmware to the Apple TV. You should still save your SHSH blobs using Tiny Umbrella in case an exploit is discovered.i Tunes tried to enter the Restore Mode, but the device turned back to the Recovery Mode.This can happen when updating an i Pad 2 jailbroken with Saffron gets updated to i OS 5.In this case simply retry, as it is in Recovery Mode then anyway.
Missing system files or corrupt data in i Tunes installation.
This error is common when downgrading i Phones and 3G i Pads.
The problem occurs when the device's baseband has a higher version number than the baseband in the firmware you restored to.
Updating to the latest version of i Tunes and then restoring should resolve this issue Reportedly happens during failed downgrade attempts (i Phone OS 2.0 to 1.1.1, i OS 5 beta to 4.3.3).
Check system time, reset Internet connection, update root certificates. This occurs when the media library on the device is corrupt and cannot be modified or updated.
Restart computer; change USB port; reinstall system. Known on damaged bundles from unofficial Pwnage Tool distributions or bundles.