Not able to update iphone
The iPhone could not be updated. An unknown error occurred (4000).
iPhone SE, iOS 11
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Troubleshooting:
Turn your iPhone on and unlock it -> enter the passcode.
Go to Settings -> set Auto-Lock to Never.
Connect your device to your computer using an Apple USB cable & try also another USB cable.
(macOS) -> Make sure your Mac has the latest version of macOS or the latest version of iTunes.
(Windows OS) -> Make sure your Windows PC is up to date & iTunes too.
See also -> Check your third-party security software.
Check the Wi-Fi connection.
Turn Off Hotspot.
Turn Off or remove VPN if necessary.