Thread: Firmware downgrade for 721xs to recognize custom maps

Thanks Caty, i'd forgotten where i originally got the boote.de link and clearly it was you who first posted it to help fbomb with his echomap70dv. That's a touch-screen plotter very like GPSMAP721xs.

Alex, The difference between the 'button' operated devices like echomap50 and 'touchscreen' devices such as yours for entering boot-block is that all you need do is hold the power button until 'Holding' appears on the screen then release it to start the downgrade. With the button devices power is still held but the 'up arrow' button is released. Info:

Code:

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For placement of gupdate.gcd on the SD card, you can proceed as i said earlier in P#8 and run just ChartplottersUpdatewithSDcard_20140909.exe or, as said to fbomb in the other thread, extract the file and then extract 'program_card.exe' and look inside folder 'Root' to find folder 'Garmin' with the gcd inside. You should read Caty's[Only registered and activated users can see links. ] in the other thread too in case it's relevent to your unit as well.