fishman393 Posted April 2, 2016 Posted April 2, 2016 I got a great deal on a humminbird 999ci hd si KDV. Here where my problem is. I went to humminbird Web site to reg. It and says invalid serial number. Is there a way to update this unit another way? I have emailed them but would like to do it sooner. Any help I thank you Quote
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