Its showing update reqest and stucked

See this article:--> If you see an Update Failed or Apple Pay Not Available alert after iOS update or restart - Apple Support

If the issue persists, contact Apple Support using the link at the bottom of the article itself.

If your mean something different, please better specify your needs, listing your iPhone model, its current iOS version, when and how you get the error message, writing the exact content of that message, etc.

Regards

Giulio