[Elecraft] Firmware version question: K2

[k7gt at charter.net]

I have firmware 2.04/1.09 in my K2. As I am contemplating getting the
K60XV mod kit to allow my K2 to use low-level signals to interface with 
an
XV144, I have checked out the K60XV order page. An item  FWSSB is shown
there stating that it is needed to use SSB with low-level transverter 
interface.
Are not these features already in firmware 2.04/1.09??

Allan K7GT