Hi Caty, good call! This is worth trying.
I would also use RGN_Voice_Editor to see if the voice is supported already by your firmware. The chinese firmware may be like the taiwanese firmware and some voices may not be supported. I would try to add it in the firmware and reprogram.
download here: [Only registered and activated users can see links. ]
If it works but the voice prompts do not make sense, I would try patching the firmware using RGN_Tool just to see if it fixes the problem.