I heard many people complaining on having Sm-G900f firmware on sm-G900v bootloader. This is done by some local 'experts' who wants phones from foreign countries be able to use their home network. I had the same problem, but is not any big deal, I just flashed sm-g900v 6.0.1 firmware with Odin and everything went smoothly without deleting anything from my phone after the upgrade. I have better battery life and smooth experience and now my private mode is working. Below are some of the screen shots of my phone.