Talltimber,
Check your Humminbird account as the 5.400 software for your 788ci should be there. Load it to your 788ci unit and the 5.410 software for your 998c Si unit and they should work over the InterLink. Disconnect both units from the InterLink while you are loading the software and than power both units off. Connect whichever unit was connected to the Port 1 connector on the InterLink and power that unit on. Allow it to update the InterLink and than you should be able to connect the other unit and everything work.


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