DFU means Device Firmware Upgrade mode, it allows all devices to be restored from any state. If you are stuck in DFU mode while upgrade or restore iOS, this video shows you how to fix iPhone boot loop problems without data loss.
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1. Connect iPhone to PC/Mac via USB cable.
2. Download and Launch ios system repair.
3. Click on "Repair Operating System” option, download the firmware for your iDevice and restore it without data loss.

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