Apple released iOS 17.3.1 on February 8, and as is traditional, and has now stopped signing iOS 17.3, making downgrading to that version of iOS no longer possible.
The iOS 17.3.1 software can be downloaded on compatible devices over the air by going to “Settings” -> “General” -> “Software Update.”
iOS 17.3.1 is the latest version of iOS 17 that is available to the public. It brought a fix for a text-related bug
Falling back to an older iOS build is often used by users who jailbreak their iPhones. Restoring an iPhone or iPad to a previous version of iOS can also sometimes be helpful for users who experience significant bugs after upgrading to the latest version of iOS.
