my iphone is unable to install software update 14.7.1

NNR501 wrote:

Why won't my iphone 11 install software update 14.7.1?

If your iPhone, iPad or iPod touch won’t update - Apple Support

My iPhone 11 (with iOS14.6) does not upgrade to iOS 14.7.1

I have tried -

1) Resetting the network connection,

2) Restarting multiple times and even

3) Erased all content and then restore the phone but still, I am getting the same error as shown in the attached screenshot.

No matter what I do but could not get through this error.