How to Downgrade iOS 9.3.4 to iOS 9.3.3 to Jailbreak iPhone or iPad

Apple released iOS 9.3.4 yesterday, which has been labelled as an “important security update”. As per the iOS 9.3.4 security document on Apple’s website, the update patches a vulnerability discovered by the Pangu Team. This vulnerability has been used by the team in iOS 9.3.3 jailbreak, but since it has been patched in iOS 9.3.4, the jailbreak is incompatible with iOS 9.3.4.
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