For ModusToolbox™ version 3.x, there is a tool called the BSP Assistant to create and modify BSPs. Refer to the

BSP Assistant user guide

for details about using that tool.

For a better understanding of the contents and structure of a BSP and more detailed information about how to create a custom BSP, as well as update the Wi-Fi and Bluetooth® connectivity device and firmware in a BSP, refer to Application Note AN235297.