HT201263 My iphone 4 is not restoring

As stated, It isn't restoring properly. I go all through the whole process, and then it'll get to "Preparing Iphone for restore" and load to the end, but than my phone randomly turns off and restarts, saying to connect to itunes again, than I get the unknown error 21. I have tried multiple times and read up, not many people have this problem but most people answer saying just keep trying and it'll work. I've tried for over a week multiple times a day, nothing is working for it and I have narrowed it down to being a battery problem, but I just wanted to know if there were any other ways to get the restore to work, cause replacing the battery is extremely expensive. Thank you.

Hello there, MajesticPuffin.
The following Knowledge Base article provides information on your particular error message and how to work on resolving it:
iTunes: Specific update-and-restore error messages and advanced troubleshooting
http://support.apple.com/kb/TS3694#error21
Particularly:
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. 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.
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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