My iPhone won't restore. It is in dfu mode and when I try and restore I get an error 21 message. I have tried to reinstall iTunes and disable my security and firewalls. No luck apple say send in for a 348 buck hardware reset/fix. Any thoughts.

I am open to trying anything. Until I plugged it into computer I just kept getting a apple symbol then it would turn off every five second it would light up then turn off. I man the boost network and don't live near an apple store. 3 hours away! Would Telstra or Optus shop look at it ? Or should I just send it too Apple and pay. It is 14 months old my iPhone 5

Error 20, 21, 23, 26, 28, 29, 34, 36, 37, and 40
These errors typically occur when security software interferes with the restore and update process. Use the steps to troubleshoot 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 the 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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