Hey there, I got a White/Silver 5310 from Rogers Canada

I got someone to unlock and debrand it, right now it has:

Firmware:
6.62
10-04-08
RM-304
Variant 00.00

Language:
6.62
10-04-08
RM-303
Q

(The bolded are things that confuse me)

Anyways, right now, my phone can display chinese mp3 names. But I know that once I update my firmware, I will lose the chinese language pack (my phone's product code is from North America)

So is there some way for me to update the firmware, and then re-patch it with a chinese language pack?

Thanks.