Try this solution by Damien. Do not use the 3rd party software iRecovery. It might void your warranty.
For the Mac Users try this
In the Finder, locate iTunes in the Applications folder and drag it to the Trash.
Go to
/System/Library/Extensions
and locate the file called
AppleMobileDevice.kext and drag it to the Trash.
Go to
/Library/Receipts/
Locate the filecalled
AppleMobileDeviceSupport.pkg and drag it to the Trash.
Go to
/System/Library/LaunchDaemons/
Locate the file called
com.apple.usbmuxd.plist and drag it to the trash
Go to
/System/Library/PrivateFrameworks
and locate the file called
MobileDevice.framework and drag it to the Trash.
Empty Trash and restart the computer. Empty the trash again if needed
Download and install the current version of iTunes.
Now try your restore again.
You can also try mrangelos suggestions “Ok this is what I did. I used a windows xp machine (not vista, not windows 7) and these were the steps that worked for me:
1. download libusb win32 and install this.
2. download and unzip iRecover into a simple folder for example: c:ir
3. open the command prompt: Start menu -> Run -> type cmd -> press enter -> you see a black box with a blinkin cursor
4. goto the folder by doing this: type c: -> press enter -> cdir -> you’re in the folder
5. now you’re going to do the instructions
6. start the program: type iRecovery -s -> press enter
7. the program starts (if you get a message that it sees usb but no device, turn on your iphone, make sure it’s connected with the usb cable and go to step 6.
8. program shows some information (never mind that) and it gives the oppurtunity to type command that it will send to the iphone, so type this and end every line with an enter:
setenv auto-boot true
saveenv
/exit”
For more info check out the apple thread.
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