IPhone 5 error 21 in iTunes when updating?!

I am stuck in error 21 when (update and recover) with iTunes. I tried the DFU mode but while restoring after extracting and verifying with apple store it enters Recovery Mode and the Error came up ! What should I do?! I can't open my iPhone and I can't do anything with it.

http://support.apple.com/kb/ts3694#error21
Error 20, 21, 23, 26, 28, 29, 34, 36, 37, 40
These errors typically occur when security software interferes with the restore and update process. FollowTroubleshooting security software issues to resolve this issue. In rare cases, these errors may be a hardware issue. If the errors persist on another computer, the device may need service.
Also, check your hosts file to verify that it's not blocking iTunes from communicating with the update server. See iTunes: Advanced iTunes Store troubleshooting—follow steps under the heading Blocked by configuration (Mac OS X / Windows) > Rebuild network information > Mac OS X > The hosts file may also be blocking the iTunes Store. If you have software used to perform unauthorized modifications to the iOS device, uninstall this software prior to editing the hosts file to prevent that software from automatically modifying the hosts file again on restart.

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You'll have to put your iPhone in Recovery Mode.
Recovery mode
If you've never synced your device with iTunes, or haven't set up Find My iPhone, you'll need to put your device in recovery mode. Then you'll restore your device as new or from a backup.
This will erase the device and its passcode.
Disconnect all cables from your device.
Hold down the Sleep/Wake button, then "slide to power off" to turn off your device.
Press and hold the Home button and plug the device into your computer. If your device doesn't turn on automatically, turn it on. Don't release the Home button.
Continue holding the Home button until you see the Connect to iTunes screen.
If iTunes doesn't open automatically, open it. iTunes will alert you that it has detected a device in recovery mode.
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I got this message. After several hours of frustration...
I finally did a successful update by following various recommendations in this thread.
Maybe all or only a combination were necessary:
1) Deleted my backups. This DOES appear to be necessary, I noticed that the update was always failing when the update was going through the backup process. It was only after I deleted my backups that the update finally worked. To do this, in iTunes go to Edit > Preferences. Click on the Devices tab. Click on (select) the iPhone in the window. Click on the "Delete Backup" button.
2) Disable automatic syncing for the iPhone (don't know if this was necessary but it's one of the steps I took)
3) Make sure all your Apps are updated before trying the iPhone update. (Again I don't know if this was necessary but I did it). I updated my apps over wi-fi from the iPhone rather than via iTunes.
Important!!!!! After you run the update there will be no backup of your iPhone. You need to create a new one. To do this, right click (option-click) on your iPhone in the "Devices" list of iTunes. Select "Back Up" from the context menu.
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http://support.apple.com/kb/TS3694#error3014

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I am also facing the same issue.
four days back, my power buttton stopped working.
Then my sim card slot stopped reading like it was stuck at gsm/cdma band.
Even without simcard it said searching..
then I changed the power button and antenna strip myself as my iphone5 is uk ee and i live in india.
Everything was fine and I booted the phone.
The power button worked like a new device... but the searching problem still remained.
I hard resetted my phone but to no vail. even Find My phone was not turning off.
then I forced my phone to recovery mode and downloaded iphone5,2 7.0.2,11A501_restore.ipsw from web and flashed it.
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HT4623 i cant open my iphone, its showing that ( iphone is dsabled, connect to itunes) when i connect to itunes its showing message on computer screen that ( itunes could not connect to the iphone, because it is loked with passcode. you must enter your pa

I cant open my iphone, its showing that ( iphone is dsabled, connect to itunes) when i connect to itunes its showing message on computer screen that ( itunes could not connect to the iphone, because it is loked with passcode. you must enter your passcode on your iphone to connect with itunes.
appreciated

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HALLO 4 ALL
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IPhone 5 error 21 in iTunes when updating?!

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