i did that...
i tried to do it again and again but nothing, no hong kong chinese..
i tried also with taiwan chinese... but still nothing, no taiwan chinese...

i finally have my own idea about it...
chinese from china or from hong kong/taiwan are different... maybe is not possible to use both with the chinese firmware...

just like i read somewhere that is not possible to add chinese to the european firmware
probably is not possible to add a different kind of chinese (different set of characters) to this firmware..

i wonder, maybe is possible to add china chinese to the hong kong firmware? =))

anyway im happy already