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how to put an old software version back on edge 1040

figue 3 days ago

good evening
i got a version 21.18, but i can't go back to this version on the gps (i have 25.25) when i paste it in the garmin folder and i turn the gps back on nothing
appears so i can do it?
Is there a way to do it,
thanks in advance

0 L.Rouge 3 days ago

Due to the 24.54 / 25.24 / 25.25 change to the 1040 file structure from "mass storage" to "MTP" (Media Transfer Protocol) and the change to the version update file format / type from "GUPDATE.GCD" to "GUPDATE.GSP" a reversion to older software may no longer be possible. I have not seen any recent (since 25.xx) reference to anyone reverting. Some of the beta versions seem to have been "patch" type updates rather than complete new versions so this also would indicate reversions might not now be possible.