[Elecraft] K2

[Jean-François Ménard]

A friend of mine would like to buy this K2 as described below:

K2s, s/n 3155, which has the following options:
installed: KNB2, KAF2, KSB2 & K160M. I purchased this K2 in Dec. of 
2002,
and built it in 2003. This K2 was built with the K2 toroid kit from "The
Toroidguy,"

Could someone tell me which modifications this K2 must  be done to be 
at the same level of  today's K2, Firmware upgrade, etc. ???

Thanks for your help.

73