Not if it's running 'hacked to English' firmware which make the camera masquerade as not CN.If it is a CH camera won't you get "upgrade failed" if you try to use WR firmware?
By installing modified, non-stock, firmware to make the China-market cameras appear to be International market cameras.So how did the sellers of these grey market Chinese cameras with English language make them this state before shipping them to customers.
On a newly-bought camera, one clue is if the firmware version shown in the System information on the web GUI is not the same as the as-manufactured firmware version that's printed on the camera or box label. And on the older models, the letters 'CCCH' in the serial number suggest a China-region camera.And how can one determine if 'hacked to English' firmware is being run?