Hello,
I also just got Fifa 15 PROTOCOL but COMPLEX too. Neither of them are working, I always get a game error (I suppose that's the name in english), where it says that I shall download another version. I extracted the .iso with 360mpgui to a USB drive and then copied the files to the internal HDD.
I have FSD 3, Dash Version: 3.0b Rev735, Kernel Version: 2.0.16203.0
Could you please tell me if there is a need to update something or doing something else? I would be very thankful.
skogaard