I think mine is legit China version...@speedtripler , as i know, you can reflash the original CN rom on the china unit, yes.
Also make sure not to relock your bootloader once you have flashed anything else than the original ROM of the phone because will soft brick it .
CN version CN ROM, global version global version , etc. ( check phone model to see what phone version you are using )
Also make sure to check the rom you are using if you didn't purchased the phone from official channels.
Some sellers tend to flash a custom rom without users not knowing about it .