These are freshly installed with Carthage 0.29.0.
As soon as the FirebaseApp.configure() is called, I get an error:
+[FIRSwizzler currentImplementationForClass:selector:isClassSelector:]: unrecognized selector sent to class 0x10279f6f8
I thought it might be a linking issue. I have only linked FirebaseSwizzlingUtilities.framework, but adding any other related frameworks, like FirebaseISASwizzler.framework results in a compile-time error.
@Gujci Try removing Carthage/Build/iOS/FirebaseSwizzlingUtilities.framework. It is no longer part of Firebase 5.4.0. It was split into FirebaseISASwizzler.framework and FirebaseMethodSwizzler.framework.