Dear Alexander!
My name is Vladimir Obrizan, I'm a director of Design and Test Lab, a small mobile software development company with 3 years of experience, located at Kharkov, Ukraine.
Apple releases new Xcode (a tool to build apps) every 6 months, so it maybe it is needed to re-build it.
I'm not sure about scope of work to do, however, some similar cases took about 1-2 days to complete.
-Vladimir