How to revert to non beta iOS 17?

Hi everyone, I seem to have a serious problem with slow data download speeds on iPhone 12 Pro. I've updated to latest iOS 17.4 beta - but still have same problem. The beta is also on other iPhone SE v2, but it's not a problem. How do i revert iPhone 12 Pro beta back to non beta version - ideally iOS 17.3.1? Appreciate any help - thanks.

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Google says: https://support.apple.com/en-us/108763

Thanks myuncle, i appreciate your help.

I have already tried this link ... and i've turned off new Beta Updates.

I then completely Erased and Restored old data - but still have iOS 17.4 beta as the OS.

I can't find a way to revert to iOS 17.3.1, so i wonder if i'm not actually able to do this. Maybe some data on iOS 17.4 isn't backwards compatible?

Any idea what i'm doing wrong or what else can be done?

Thanks !

I can't remember but when I did this, I had to go to software update and reinstall the non-beta version of iOS.

Once you remove the beta profile, go to Software update and it should let you 'update' to the non-beta version. Sorry, it's been a while since I did this. I can't remember exact steps.