Earlier, during the advent of the iPhone 4 and iphone5 , the error 23 when the iPhone firmware was considered one of the most difficult to eliminate. The thing is that the cause of this error in most cases was complicated hardware problems with the radio module device, which was possible to solve not in all cases.
Now, with the advent of experienced service engineers who specialize in the repair of machinery Apple, and the emergence of a good professional equipment, the chances of a successful iPhone repairs are much higher. Therefore, if your iPhone is not sewn and Restoring an error (23), do not despair - contact the service center, which experts can conduct a comprehensive diagnosis device and the maximum quality of its repair.