Unable to update my iPhone 5s to iOS 15.1

jiten85 wrote:

not able to update ios 15.1 I 5s please suggest

[Re-Titled by Moderator]

You shouldn't be surprised that you can't. The phone was released in 2013, 12 years ago. It's not only out of date, it is Obsolete and can never be updated higher than iOS 12.

That's correct. iOS 12 is the end of the line. That device is obsolete.