A new OS for Chinese phone?

I bought an Android phone from China (since phones are so damn expensive here in Finland). Here's the link to the phone:
Automatic Redirect

Camera is bad, but I don't even use it so I dont care (for me phone and camera are a different thing). The phone is pretty fast, no lags etc. There is one crappy thing, as it has many texts in japanise. If i want to save a phone number to my contacts, it will be in chinese. It has the Qualcomm 7227 600Mhz processor, and i heard it supports Ginger 2.3. (currently holding 2.2)

So how do I remove the OS it has and istall 2.2 or 2.3, whichever is more compatible with the phone. I checked the forums, they had these guides for only certain Anroid phones so I don't know that will they work on this one.

So i just want to remove the OS it has, and install a new clean English one.
Help very much appreciated.

EDIT:
Oh, it lags actually pretty much. Just loaded some games from Android market and they dont run that well... Well, would still appreciate if someone helps with the OS