Thanks for the post, and sorry to hear about the difficulties you're having pairing the VI300 with the ST300.
I have seen issues before where a ST300 and a set of VI300 speakers will not pair because of the different frequencies (frequency regulations in those specific countries). We always recommend that system and components are purchased in the same country to avoid compatibility issues, but lets try troubleshooting your setup just to cover all of our bases.
Are the two receiver boxes for the VI300 set to different channels? One should be set to "L", the other set to "R". Lets unplug the power, make sure those are set correctly, plug back in, and attempt setup again.
What happens when you attempt setup? Do you get any specific sort of LED blink pattern?
Hi there shyuanzhen,
Thanks for the information. It does sound like the two are incompatible because of being purchased in different countries. Which country are you located in? You may want to contact Bose support in your country and see if you can return/replace the device that isn't compatible for your locale.
Let me know if you have any more questions.
Brandon - Bose Support