Software Update During Iphone Transfer. Do not disconnect your device or click on Stop and let the software download and install completely. Go to Settings General Software Update.
Tap Customize Automatic Updates or Automatic Updates. This is the last step you can take to completely rule out a software or a firmware problem. Besides how-to another frequently asked question about the data transfer on an iPhone 1211 is why it takes so long.
Finally if your iPhone gets stuck on Update Requested you can perform a DFU restore which will erase and reload all the code on your iPhone and update it to the latest version of iOS.
For me the transfer from phone option was a big mistake and caused I think the software update failure. Why Long Time to Transfer Data to New iPhone 1211. Check that both phones are at least half charged or connected to a power source. If you are running an iOS beta on your old device enroll your new device in the beta public developer restart and update it.