When launched the expected Pangu jailbreak of iOS 9.3.3 , this was not compatible with 32 - bit devices, something that did not sit well at all among owners of such devices.
Well, as declared Luca Todesco, a known hacker iOS scene, all users who have a 32 - bit device and are interested in the jailbreak should not upgrade in any way to iOS 9.3.4.
by the way, if you're on 32 bits you may want to stay on 9.3.2 / 9.3.3
16:24 - 24 ago 2016
(just happen to have been working on some code between defcon and my vacation around cali that exploits the 9.3.3 IOMFB thing on 32 bits)
Apparently, the hacker has been working for the exploits run on 32-bit devices, so presumably will soon publish a tool compatible with these devices.
In addition, Apple continues to sign iOS 9.3.2 and iOS 9.3.3, so if you have upgraded to iOS 9.3.4 you can return without any problem, which I highly recommend if you are interested in the jailbreak.