Did this. (Updated). Before with 2.660 could see a swivel, a sinker, and minnow 15 ft away from transducer. Now cannot see a 1/2 oz sinker three ft away from transducer no matter what settings the helix mega si and helix 8 di g4 n's are set at. Plus there is a ton of interference that was never there before. Going back to the 2.660 if I can. Wondering if I have to go back to the 1.150 on the mega live transducer also and were to get the prior updates from as I could not find those prior system updates on hummingbirds site. Does anyone know where to get these prior updates (2.660 for helix di and 1.150. For mega live).