ipad

Two alternatives:

Keeping in mind that this workaround can affect keychain and/or Apple Pay (if in use, you might need to re-input data), try these steps to solve error 4000 on your iTunes:

• Disconnect your device from the computer
• Temporarily disable the passcode on your iPad
• Restart the iPad
• Restart iTunes
• Reconnect the iPad to your computer and restart the update procedure.

When finished, re-enable your passcode on your iPad.

or

Update your iPad wirelessly (via wifi).

Regards

Giulio

ProustGiulio said…

”or Update your iPad wirelessly (via wifi).”

I would recommend updating with wifi, as Giulio said.