Turn off the transceiver.
Press and hold F-4 and F-5 while turning on the IC-9100.
DO NOT RELEASE F-4 AND F-5 UNTIL YOU HAVE READ THE VERSION RESULTS.
Results will appear at the bottom of the display. Refer to Fig. 1.
F_# = Front (currently no updates)
M_# = Main (currently no updates)
DM_# = DSP Main (Current version should read 3.03)
DS_# = DSP Sub (Current version should read 3.04)