Square Enix has apparently decided that jailbroken phones are a no-go. According to a Reddit post, Deus Ex: The Fall doesn’t allow players with jailbroken phones to fire their weapon. It’s likely that the developers are trying to prevent software piracy, which usually happens on jailbroken devices. The biggest issue here is likely going to be with those players who do not use pirated software and have other reasons for jailbreaking their phones.
Given Apple’s willingness lately to open up iOS a bit more to developers, we can only hope that jailbreaking becomes less necessary for some users. I’ll be keeping tabs on this block to see if people actually find a work-around, otherwise you’ll have to have a fresh, un-jailbroken version of iOS installed to play this game.