Thank you very much for your click reply.Do you know If I can directly upgrade from 4.2(1) to 4.2(3) using the ciscocm-ffu.4-2-3.exe file found on Cisco download section ?PS : OS is 2000.4.3a right nowThanks again.Adrien

Hi,I need to do an upgrade from 4.2(1)sr1b to 6.1(3).The compatibility matrix that you provide doesn't tell if I can go from 4.2(1)sr1b to 4.3(2) or if I can go from 4.2(1)sr1b to 6.1(1). I already know that I can't go directly from 4.2(1)srb to 6.1(...