You can view the current firmware version of your Philips SpeechMike by using the Philips Device Control Center aka Speech Control.
STEP 1: Connect your Philips SpeechMike to your computer
STEP 2: Open the Philips Device Control Center application
STEP 3: Select the blue [i]
A dialog window will appear displaying information about the currently connected device.
Verification Source: In-house testing