What is a driver version?

First you need to understand which major driver release your interface represents:

For interface v2.3.0 - v2.5.0 and higher, you should have the following interface:

In this case, you can view the current firmware version on the  panel "Overall Stats-> About system" or on the panel "System Menu->About".

For v2.0.1 - v2.2.5 (old), you should have the following interface:

In this case, please read documentation at the following link.

For 1.3.17 - 1.3.6 (old), you should have the following interface:

In this case, please read documentation at the following link.