I lucked in.
My S5 from Voda came with the older firmware and I was able to gain root with Towelroot.
That was even after letting it download updates (made the same mistake with my Transformer but Towel didn't work with it).
The guy in Voda said their phones are no longer carrier locked is that true?
Sent from my Transformer
Asus Transformer Pad TF701T 64Gb w/ dock CROMi-X 7.0
Samsung Galaxy S5 G900i 16Gb Stock rooted 4.4.2
Asus Transformer Prime TF201 64Gb w/ dock CROMi-X 5.4
Samsung Galaxy S III GT-I9300T 16Gb Sotmax V19