I get this error when trying to install on iPad Air 2, iOS 8.4. Same error using both iFile and Filza.
target detected /User/Containers/Bundle/Application//F1E21A95-E181-4E24-8DFB-07F9B821BAEF/ModernCombat5.app/ModernCombat5
detect FAT_MACH_HEADER
detect armv7 module offset 4000,size ef3770
detect armv64 module offset 400000,size 7037ef00
start to do swap header trick
target detected /User/Containers/Bundle/Application//F1E21A95-E181-4E24-8DFB-07F9B821BAEF/ModernCombat5.app/ModernCombat5.crc
couldnt find FAT_HEADER stop immediately!