Here is your problem "Fish on Line". If you go here to Humminbird's Support on Helix 5 and 7's,,scroll to very bottom of page for small fine print on installing 1.90 and read the instructions.
https://www.humminbird.com/support/software-updates/HELIX-5-CHIRP-DI-GPS-G2-v-1-900-question
its on the 5 so far but not the 7
Your probably going to have to send your 7 back to humminbird and get the hardrive flashed .


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