Batarya orijinal değilse bu hataya sebep olabiliyormuş.
"To fix the error 29, you need to replace your battery with the original One, and start the restore / Update process again VIA iTunes."
"Below are the possible methods to fix iTunes error 29 and complete the restore / update process: Problem with the Battery - Did you changed the iPhone battery recently? If you have changed the battery of your device, this can be the problem because you got error 29 in iTunes. To fix the...
Simple way on how to fix iTunes error 29 on iPhone 4S 5 5C 5S 6 6+ 6S 6S+ .