Thread: IMPORTANT! If you want HELP in case of a bricked Garmin device, please follow this

@Butters

First of all - thank you for finding time to answer.

Question 1: What file type were you trying to flash with WU when it gave that message?
Question 2: Have you tried that? If not try now and report what happens.

I've tried different ways with WebUpdater.
Scenario #1
- open WU, click Next
- now it detects device (as described at previous post):

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[Only registered and activated users can see links. ]

- click next, received:

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[Only registered and activated users can see links. ]

- click next, received:

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[Only registered and activated users can see links. ]

- then information windows:

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[Only registered and activated users can see links. ]

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[Only registered and activated users can see links. ]

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[Only registered and activated users can see links. ]

- clicked next, it showed downloading window for very short time (maybe it has cached somewhere), and displayed error:

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[Only registered and activated users can see links. ]

- clicked ok, finish:

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[Only registered and activated users can see links. ]

Scenario 2:
- drag-and-drop [Only registered and activated users can see links. ] to WebUpdater icon
- app opens:

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[Only registered and activated users can see links. ]

- click next, received

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[Only registered and activated users can see links. ]

- click next, and comparing to Scenario 1, it skips all other steps and:

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[Only registered and activated users can see links. ]

- clicked ok, finish:

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[Only registered and activated users can see links. ]

What else I've tried:
Found at PC cached old firmware 8.10 that I've installed via Garmin Express after watch was bought (all next ones were via Wi-Fi, including deadly 16.60):

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[Only registered and activated users can see links. ]

It was definitely fine, so I've decided try it.
Drag-and-Drop to WebUpdater (Scenario 2 from above) - same result as for 16.60
RGN tool & Updater
- converted GUPDATE.GCD to GUPDATE.RGN
- renamed GUPDATE.RGN to 328801000810.RGN
- loaded it via Updater, same result - progress bar only and stuck at middle. When it was moving at beginning there were no "Garmin USB GPS" at OS, when it moved forward after 10-20 secs - "Garmin USB GPS" appeared at OS and stuck:

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[Only registered and activated users can see links. ]

- WebUpdater now shows 8.10:

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[Only registered and activated users can see links. ]

- Scenario 1 gives the similar result as for 16.60, just tells about newer 16.60, and gives corrupted error

Summary - I suppose RGN tool does not work properly with such kind of GCD firmware.
According to version history at README last supported Garmin device was Fenix 3 HR (released 5 years ago)
"v0.94 - Support for fw_all.bin file in fenix3HR and D2Bravo"
Is there any chance to reach tool's author for assistance?