TS3694 when i try to restore my phone i get a error 21 message , how can i ressolve this ???

my iphone 4 will not restore when i try to do it i get a error 21 message , what do i try next

Check for hardware issues
Try to restore your iOS device two more times while connected with a cable, computer, and network you know are good. Also, confirm your security software and settings are allowing communication between your device and update servers. If you still see the alert when you update or restore, contact Apple support.
Common errors: 1, 10-47, 1002, 1011, 1012, 1014, 1000-1020.

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TS3694 when i try to restore my phone on itunes it stops half way through and says error 29 unable to restore

when i try to restore my iphone 4s it say unable to complete restore error 29 now i cant use my phone at all

Hello, gordy69.
Thank you for visiting Apple Support Communities.
I see you came from the most relevant article in regard to not being able to restore your iOS device. I would take a look at the section I highlighted below. Make sure to try the steps outlined in that section.
Check for hardware issues
Try to restore your iOS device two more times while connected with a cable, computer, and network you know are good. Also, confirm your security software and settings are allowing communication between your device and update servers. If you still see the alert when you update or restore, contact Apple support.
Common errors: 1, 10-47, 1002, 1011, 1012, 1014, 1000-1020.
Resolve specific iTunes update and restore errors
http://support.apple.com/kb/TS3694
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TS3694 i think itunes has removed my iphone software. because now not showing home screen. when i tried to restore my phone there generated an error no is 1015. please help me how can i recover my iphone again?

i think itunes has removed my iphone software. because now not showing home screen. when i tried to restore my phone there generated an error no is 1015. please help me how can i recover my iphone again?

From the article which you posted your question from:
Errors related to downgrading iOS
The required resource cannot be found: This alert message occurs when your device has a newer version of iOS than what is available in iTunes. When troubleshooting a device that presents this alert message, go to Settings > General > About and check the version of iOS on the device. If it is newer than the latest released iOS version, the device may have a prerelease developer version of iOS installed. Installing an older version of iOS over a newer version is not supported.
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Your device has unauthorized modifications to iOS, also called "jailbreaking."
Use recovery mode to restore your device to the latest version of iOS.
Resolve iOS update and restore errors
http://support.apple.com/en-us/TS3694
Sincerely,
Allen

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TS3694 when i try to restore my phone i get a error 21 message , how can i ressolve this ???

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