Firmware flashing for W880i ( Language problem )

I have a W880i with me and currently using it. I have a great problem that this phone doesn't support Chinese language. All my Chinese language messages are weird symbol. I would like to trying to do flashing by myself, to have Chinese/English language and Chinese/English input on it. I have absolutely ZERO knowledge on these and i would like to have some guiding on it.

I have search through the internet to learn the flashing thingy but ended up confusing because each guides are giving different method and i don't know which to follow. All the guides are also not based on W880i example, but with other model. I seriously do not want to spoil my phone by blind flashing it.

I need some help. :a018:

Some software info of my W880i :
R8BA024 , updated through SEUS few days ago.