Unpack Xperia M2 Kernel Troubles

Hello XDA ;)

I'm trying to unpack latest .17 kernel, I tried extracting the img from the kernel.sin and using a boot.img from a Cwm backup, but it's impossible, I always get and error saying Android boot magic not found... And I realized it's true because instead of Android! It says ELF at the beginning...

I saw DoomLord has some tools in perl but they returned me the exact same error.

Does anyone know how to decompress it? :)

Thanks!