: Since Apple does not allow direct sideloading of IPAs on un-jailbroken devices, these files typically require tools like Sideloadly or a jailbroken environment using AppSync Unified to bypass signature checks.

Instead of fighting iOS 5.1.1, consider:

Find the keys for CFBundleShortVersionString and CFBundleVersion .

If the App Store method fails, or if the "last compatible version" prompt does not appear, you will need to manually sideload the Netflix IPA file. Prerequisites A computer (Windows or Mac). A USB dock-connector cable.