Currently Being ModeratedMay 26, 2013 12:25 PM (in response to H3N)
Charge with the AC adaptor for at least 30 minutes and press the home and power buttons for up to 45 SECONDS, releasing when the Apple logo appears. If it still shows no signs of life, there is a hardware failure that needs evaluation by Apple or whoever provides iPhone service in your location.
FYI, if you have an iPhone 4, you can't have iOS 6.1.4, which is for the iPhone 5 only.
Currently Being ModeratedMay 27, 2013 11:47 PM (in response to H3N)
Here is some information on error 21
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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