I'm also having trouble since updating to 3.71.
When it says to do a factory reset where do I do find that in the menu.
the manual is so fague and i can't seem to find anything on the internet showing how to reset.
Is it only a reset on the sounder part.
My transducer is a Tm265LH .
Now the High chirp side seems to be low on power . It drops out and loses bottom.
Also before the frequencies shown would be 53/170 now it says 50/50.