I followed this tutorial (Generating an unsigned IPA iOS application) for an application I created. I installed it onto my iphone5s with ifunbox. The problem is when it goes to launch it shows the new launch screen with Xcode 6, where it says the app and that it's copywrited and stuff, and them immediately crashes. In the iOS simulator it runs perfectly. I don't know if I'm missing a step or what. Thanks in advance.
I'm running iOS 8.1, built with Xcode 6, installed on a jailbroken iPhone 5s, written with objective-c on Yosemite. Incase that information helps.
Unsigned apps will be terminated despite iOS being jailbroken. The fix is, you can still sign with a certificate created by yourself or just fake sign with ldid.
The following link explains it in detail.