You get two files in your Humminbird account if you registered your unit.
Did you check what version of software the unit has now?
Did you check what version of software is in your account?
One is computer software to manage GPS data------HumminbirdPC
The other is a .bin file that you cannot read on your computer. That is the unit software identified by the unit model number in your account. Copy that to a blank memory card and fully start the unit up in Simulator or Normal. THEN put the card in and answer the first question YES and the second question NO. The unit will restart after the software is loaded. Remove the memory card. Do a RESTORE DEFAULTS after that.
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, 360, RC-1