while updating my iphone xs through itunes an error code 4000 occurs everytime.How to fix?

Hi there NeeRaj15,

Thanks for the post! It's always important to be able to update your iPhone. We see you're receiving an error and have a resource that may help out.

As a starting point, try the steps in this link to troubleshoot the issue: If you see an error when you update or restore your iPhone, iPad, or iPod

Let us know how that goes.

Cheers.