Soo I found a way to downgrade iPhone 4s to iOS 6.1.3 without Jailbreak : r/setupapp
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How to Download & Install iOS 13.6 Beta on Your iPhone Right Now « iOS & iPhone :: Gadget Hacks
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How To Install iOS 13.4 beta | iPhone 4/4S| First-c update 12.4 version Then Try this iOS 13 || - YouTube
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iOS 5 through iOS 9 speed test on iPhone 4s confirms iOS gets slower every year on older devices
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