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Transferring?
Part 2: 8 Ways to Fix "Unable to Complete Data Transfer" Error
Method 1. Update iPhone OS Version
Method 2. Charge iPhone While Transferring Data

Method 3. Restart Old Phone
Method 4. Insert SIM Card
Method 5. Enable Bluetooth on iPhone
Method 6. Transfer Data Using iTunes
Method 7. Enter Recovery Mode
Method 8. Transfer Data Using USB Cable.