Fix binaries compiled for armv6 for armv7(s).
Getting this error on newer jailbroken iOS devices? Illegal Instruction: 4
This is the solution!
On your (jailbroken) iOS device run:
git clone git://github.com/rub1k/fixbin.git && cd fixbin && ./install.sh
Just run fix <executable> !
https://code.google.com/p/iphone-gcc-full/issues/detail?id=6
http://iphonesdkdev.blogspot.de/2013/02/illegal-instruction-4.html