To everyone’s surprise, Apple released online this evening iOS 9.3.4 for all iPhone, iPad and iPod Touch compatible with the latest major version of its mobile operating system. It arrives only a few days after the final version of iOS 9.3.3, and has therefore not experienced any beta for developers.
In its changelog, Apple states that iOS 9.3.4 “contains an important security update for your iPhone or iPad. It is recommended to all users”. As you can see, there is a good chance that this more than minor upgrade will only fill the flaw used by the jailbreak iOS 9.2 to 9.3.3 offered by PanGu (read: Tutorial: Jailbreak iOS 9.3. 3 with PanGu and Cydia Impactor on Windows, Mac & Linux).
If you have already unplugged your iPhone, iPad or iPod Touch or plan to do so in the near future, it is obviously strongly advised not to update your iDevice to iOS 9.3.4, and to stay on iOS 9.3.3 (updating from iOS 9.X to iOS 9.3.3 is still possible as long as Apple signs the firmware). For others, you can upgrade from Settings> General> Software update.