How do I roll back an iPhone update?

Related questions

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5. Why is my iOS Update failing?
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Tags

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2. #navigate
3. #which
4. #downloaded
5. #select
6. #button
7. #click
8. #installed
9. #press
10. #blank
11. #option
12. #where
13. #backup
14. #itunes
15. #comes
16. #shift
17. #previously
18. #iphone