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The word "Loader" appearing means that the flash was initiated.

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The nonvol region backup is saved on the CARD not the Garmin drive.

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When the card has been read by the device there will be a new file name "update.log" will appear in the 1947 folder and its presence precludes further flashing attempts until it's removed from there. Please post it's contents. Also check that a file the file named GUPDATE.GCD isn't in the device's [usually hidden] .System folder in case it's interfered with the flashing process.