How to exchange FBS3 smart key frequency between 315MHz and 433MH?

If you have VVDI MB BGA TOOL, it is easy to change frequency in vvdi mb software (update software to latest version)

Select Other Function-> Set key remote frequency / Update MB smart key

You can set frequency between 315MHz and 433MHz

Method 2:

If without VVDI MB, you can change FBS3 keylessgo smart key frequency manually by soldering / desoldering the FRE resistor (marked orange in picture below)