Language settings (W580i)

[Serene]

Hi ^^
Is there any way to change language settings on the SE W580i phone so that other languages are displayed properly instead of random code? I usually use Chinese and some Japanese so it's really annoying to be typing them out in English, while the other half displays as random code. -.- It seems the phone only displays the alphabet and numbers x3
If there are no language packs, I heard some method called "flashing", though I'm not really sure what that is or if it's doable by yourself. Fees are no problem as long as it's convenient (ie, don't have to drive hours to some manufacturer to fix it). Thanks ^^

[Serene]

No one has had this issue before?.. ._.';

[Serene]

Any useful response is appreciated.