Discussion] Successfully downgraded iPhone 6 to iOS 11.4! Big thanks to u/DoggoFox123 aka Mineek (sunst0rm tool). I am open for any questions! : r/jailbreak
Complete Tutorial to Downgrade iOS 9.1 to iOS 9
iPhone 6 with iOS 10! [fluff] : r/LegacyJailbreak
tutorial|How to Downgrade iPhone 6 from iOS 10 to iOS 9?