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You've got a chance to restore it with a firmware re-flash seeing it's defaulted to pre-boot. However ..... the symptoms you've described point to a failing flash chip rather than a corrupt fw region. Only one way to find out, re-flash it with an RGN file and it'll either then boot up and work if it's just corruption, or nothing will change if it's a failing chip. If it won't even accept a flash then it's definitely toast.
I've updated the links in [Only registered and activated users can see links. ]. Download the RGN file (behind the Spoiler - MegaNZ, second link). Drag 111301000730.rgn onto Updater.exe (get it here: [Only registered and activated users can see links. ]) and then follow this:
- Select the radio button next to "USB Device"
- Connect the GPSMAP to PC
- Wait until it's recognised by Updater
- Immediately press "OK" .... and cross your fingers that Updater finishes with a 'success' message.
Spoiler: Image
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Thread: GPSMAP 78s
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14th February 2026, 01:46 PM #4Garmin/GPS Systems GMod.
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