how to fix error 21 wont let iphone restore to factory settings any suggestions useing old computer with windows XP couls that be the cause tried reloading itunes lost at this stage is the phone fixable

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how to fix error 21 wont let iphone restore to factory settings any suggestions useing old computer with windows XP couls that be the cause tried reloading itunes lost at this stage is the phone fixable

Hi

Need advise keep getting error code 21 when I try to restore my iphone 4 phone has usb and itune logo are only displayed and when I dissconect the usb from PC theres nothing unless I plug it into the wall charger then the apple logo comes on and then the usb cable and itune logo is the repairable its most anoying

any advise thanks

Windows Vista, everything not working

Posted on Jun 29, 2013 7:41 PM

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Answer 1

GregofCo

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Jun 29, 2013 8:00 PM in response to joebusa1300

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.

Also, check your hosts file to verify that it's not blocking iTunes from communicating with the update server. See iTunes: Advanced iTunes Store troubleshooting—follow 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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