How to uninstall the recent IPhone update ?

I need to uninstall the latest ios14.5 update as it has stopped an App from working which I need the information out of it.

I wiped the phone to restart from the last backup but that still left this IOS 14.5 in my phone.

You can’t uninstall an iOS update. If you are having a problem, please describe it and we will try to help you.

You can't. Apple no longer is signing iOS 14.4.

After updating recently, my phone isn’t as it used to be.

It has affected my speakers in a way ,

camera too

As already stated, you CANNOT uninstall an update.