Thread: GPSMAP 7408 Firmware 11.0 timebomb seeking firmware 9 or 10

I have no experience with downgrading chartplotters, maybe someone else will help more. However, as it's an EXE file you'll probably need to connect the plotter to your computer and run "GPSMAPSerieswithSDCard_20170825.exe". There will be a wizard to guide you with prompts and you may at some point need to okay a message that the software you're loading is older that the version on the device. But I'm guessing here.

EDIT: Instruction for UPDATING are here:

Code:

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So connect a clean SD to the PC to transfer the correct GCD file to it and then put the SD the plotter, hopefully you'll see a message about older version and can still install it. Good luck. However please understand that anything you try must be entirely at your risk because of course I really am just guessing here. If you're unsure, wait for an experienced user to reply.