Thread: Firmware downgrade for 721xs to recognize custom maps

Originally Posted by Pigom

...Now I can't use my own marine charts anymore. I would like to go back to v 3.80 (the last one whitch is working) but I can't nowhere find it...

Same situation here

Originally Posted by Cnfhbr

@ferabella

For the GPSMAP 721 unit, there is no point in going back to the old firmware, just patching your custom map with GCCMaps0.0.3 is enough.

Could you please direct me to some procedure or topic showing how to do it? Any link would be excellent, i am starting search çing that right now anyway
Sounds promising
It is a map done with cgpsmapper originally