Not sure if this should be a hardware or software topic, but chosen this.
In the manual for Workstation 3.5 page 115 it states "Sig Check Button: This checks the consistency of signatures. This button is not avaiable for ProTracks with KJ1 or KJ2 serial number prefixes".
I have a ProTrack 20 with the serial No. prefix "KJ2". My question is can I upgrade the firmware on my ProTrack to the Serial No. prefix "KJ3" or "KJ4"?
And what are the other upgrades obtained on serial No. prefix KJ3 and KJ4 ?
KJ3 and KJ4 ProTracks have a completely different motherboard. There is no upgrade from a KJ2 to a KJ3 or KJ4.