I was researching an echoMap plus 92sv version 5.20, and to generate 90 more days each time the map expires, you just have to reset the computer. Keeping the button (- and power) at the same time.
Have you tried restoring the original chartplotter factory settings via the device menu?
(Select Settings > System > System Information > Factory Settings)
Or is it not enough to reset the map expiration?
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