Is it possible to downgrade to unsigned iOS?

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Tags

1. #iphone
2. #ability
3. #software
4. #firmware
5. #touch
6. #releasing
7. #unsigned
8. #usually
9. #after
10. #jailbreak
11. #downgrade
12. #version
13. #useful
14. #signing
15. #weeks
16. #stops
17. #update
18. #older
19. #apple
20. #upgrade