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the iPhone could not be updated. An unknown error occurred (4000). when I try to update the software through iTunes. Please help me to give a solution
iPhone 8 Plus, iOS 13
First, try to get a backup. How to back up your iPhone, iPad, and iPod touch - Apple Support
Then try these steps > If you see an error when you update or restore your iPhone, iPad, or iPod - Apple Support
If the error 4000 persists, unfortunately that is not an error Apple documents: iOS update and restore errors - Apple Support
There are some reports that putting the iPhone into DFU and reloading the iPhone from iTunes might get around the 4000 error, as well.
Failing that, contact Apple Support using the Get Support link in the upper right of this webpage,
First, try to get a backup. How to back up your iPhone, iPad, and iPod touch - Apple Support
Then try these steps > If you see an error when you update or restore your iPhone, iPad, or iPod - Apple Support
If the error 4000 persists, unfortunately that is not an error Apple documents: iOS update and restore errors - Apple Support
There are some reports that putting the iPhone into DFU and reloading the iPhone from iTunes might get around the 4000 error, as well.
Failing that, contact Apple Support using the Get Support link in the upper right of this webpage,
the iphone could not be updated. An unknown error occurred (4000). when i try to update software through itune
