This 4-in-1 firmware is valid for
The hardware revision does not affect the function nor the appearance of the device. However, second hardware revision devices require different firmware components than first revision devices. This is why different version numbers are displayed on the website (e.g. 3.65/2.65). When running a firmware upgrade, Philips software version 4.3 or later will always pick proper firmware components for the currently connected device.
To run firmware upgrades with this 4-in-1 firmware you need to use SpeechControl version 4.3 (or later), SpeechMike SDK 4.3 (or later) or PRDM 4.3 (or later).