[Elecraft] Reveision Update?

[n0jrn]

Hey gang:

I'm just finishing the build of a KAT2  for a friend.

Manual says it takes 1.05 or better to gain all features 
of the tuner.  My friend tells me he has  1.04D in his rig.

My question:

What feature will he not have using 1.04D ??

Thanks a bunch:

Jerry        N0JRN