Look, for chinese INPUT method, you have to flash the phone with china's firmware, and it will show up. I don't know "how" yet, but we you flash as i said, you will be able to write chinese, but in the FS folder it's not going to be the zc/zs/zh.t9. I saw that in a W580. I opened the FS and i didn't find any t9 of chinese, but it could write chinese :VVV

I'm getting crazy searching the "zs/zc/zh".t9