Model II / Versions from T1®
Turn the Rotary Selector to Prefs
Press the first button
Turn the first button until you see Power Stand
Press the button
The version is displayed.
The latest versions add support for the B2 Bass Module
The latest Power Stand EQ: 1.0.4 The latest Power Stand Firmware: 1.4
If you don't have that please update your firmware at this link:
L1® Model II Power Stand Firmware Updates
If you don't have a T1® see: Model II Serial Number Firmware Version