I have three KENWOOD TK-880-1 radios. I notice on power up they display "V 1.5209" for firmware version. These were on a passport system. So, some questions: I have KPG-56D V 4.01 software. I have FPRO. At present, I do not have the SJ software. I only need to program GMRS conventional frequencies and squelch codes in, no trunking. I need the proper firmware version to "downgrade" the firmware so KPG-56D will program the radios. What fimrware version do I need? Or in the alternative, is there KENWOOD software, (not Scholer-Johnson) that will work with this firmware? I have programmed TK-880's before (not recently though). I have the cable. Thanks for reading.