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Anyone have any idea?
I'm assuming you also toggled between gain 1 and gain 2 sonar curve choices ?
Sounds like you're dealing with a bit of current. Or, a bad transducer.
i know you have to turn up the gain after updating it. guessing they altered the return gains a lot. i don't fish deep, but if i had to guess they have new modes and are different return gains than they once were being not as sensitive. like mode 1 and mode 2 is now mode 2 and mode 3 and mode 1 is now gone. i think it would be wise to add more modes and give us the old modes along with the new ones.i am running mine with the gain much higher than it was with the old firmware and see no advantage of the new firmware so far.you can always go back to the old firmware if you prefer it and i can email it to you. send a pm with your email if you want a copy. you'll have it so you can test it better for your needs.would be nice to have several transducers to test settings and firmware.