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I updated to iOS 12 on my iphone SE and didn't like what it was doing so I reverted to iOS 11. Now my wifi iPad, also iOS 11 won't sync messages and in iCloud settings if I try to slide Messages on it asks for two-factor authentication. Any idea how to revert this so it just works again? It was bugging me when I updated the phone to iOS 12.

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    What do you mean "so it just works again"? Can you please edit your question to clearly state what the problem is and what you've already done to solve it? It's very difficult to understand the problem with the current wording. – fsb Oct 5 '18 at 13:14
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    When you upgrade one device to iOS 12, all other connected devices lose access to cloud stuff like messages and each device asks for two-factor authentication. I don't want this and other issues I found with iOS 12 so I reverted my iPhone back to iOS 11, which is what the iPad was always on. But iPad won't work with Messages as in the iCloud settings when you try to click the slider it says "you must enable two-factor authentication". iOS 12 must switch something on in the cloud and I just want to go back to before. – Rusty Oct 5 '18 at 23:26
  • Two-factor authentication is a requirement of iOS11. Once you changed iOS versions, you're now required to use 2FA. I don't believe it matters if you just want to go back to what you had, you still need to use 2FA now. You can also go back to a previous backup you took while you were on iOS 11 (you do have a backup, right?). – fsb Oct 6 '18 at 3:09
  • I think moving to iOS 12 switched something in the cloud for my iPad as no matter what I do it wants 2FA. Everything new breaks something old. I might switch off autoupdates and live in a cave from now on. – Rusty Oct 6 '18 at 8:19
  • I've finally got it to work. iCloud is odd and sometimes just needs a bit of time before stuff resets itself. Its back to allowing two-factor. Phew. – Rusty Oct 6 '18 at 9:40

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