HT1414 I got an error message "error 21". While restoring my I phone via ITunes

Suddenly, my iPhone 5 stopped working and gives me blinking apple sign
Continuously. 
I connected to iTunes to restore, then ITunes made necessary software updates.
As soon as it finished, it starts to explore and then stopped on a message error
21.
So I could not restore my iPhone.
What should I do?.

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.

Similar Messages

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    Thanks for using Apple Support Communities.
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    http://support.apple.com/kb/TS3694#error3194
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