What are all these Versions?
The numerous version numbers you may encounter can be confusing at first, so here is an attempt to provide an overview.
Firmware
Currently, there are three generations of firmwares, which can be indicated by the first number:
v3.xx: Latest generation of firmware. Main characteristics: Does not support the old v1.3x STorM32 boards.
v2.xx: Previous generation of firmware. Main characteristics: Strictly relies on the NT bus, i.e., does not support setups which use the I2C bus for connecting IMUs to the STorM32 controller board.
v0.96: Super old generation of firmware. Main characteristics: Only to be used for setups which use the I2C bus for the IMU(s).