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To restart your device, hold the volume and power buttons until a slide is displayed. When you install the latest version of iTunes, you can resolve this problem. How to Fix iTunes Error 1403 Restart Your iPhone A software bug can interfere with the update.You accidentally disconnected your operating system during the update.The firewall feature of the Windows system could be preventing the computer from accessing the apple servers.The network settings of your device are not properly set.Other explanations for this headache include: This glitch occurs when the update files are corrupted. Generally, the update module fails to download all the required files. The main one is irregular entries in the system elements. ITunes error 1403 can happen for several reasons.
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