petrib, thanks for replying. I can't find 3120 in the Compatibility Table eventhough this phone is being sold in S'pore. That's why I am not sure. I only found 3100 and 3200.
For 6230, I know I need PCSuite 6.1 and I have downloaded and installed that already.
As for Chinese language firmware, I was told by our local agent that they have the M'sian firmware while my phone is from S'pore, so they fear that there may be some incompatibilities (this I really don't understand) and claimed that there will be a 50/50 chance that my 6230 will be "dead" after flashing it.