If DS sees code C00, doesn’t he have a dealer diagnostic tool (permanently) connected? IIRC, if one connects the tool and there isn’t an active malfunction stored in the memory of the ECU, the display shows C00.
So, I think that disconnecting the tool (either by flicking the switch or physically removing the switch + it’s cable) could be the solution?
On my K1 1000, the connector for the dealer mode switch / diagnostic tool is located below the pillion seat / seat cover on the left side of where the rider manual / toolset is supposed to be stored. Don’t know the placement on the K7 600, though.