How to reinstall the iOS

Namcyhughes wrote:

I need to install iOS 17 on my phone and it’s talking too much of time I need to know how to reinstall back

Here is how to perform a factory reset: Restore your iPhone, iPad, or iPod to factory settings - Apple Support

There are links there to how to back up, and how to restore the backup.

Depending on what led to the need to perform a reset, a hardware problem can also cause difficulties for the reset.