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It might be physical flash damage going by the symptoms you've described. However, it's worth trying to recover it by assuming it to be a soft problem . He's the link to the firmware:
The Forerunner 645 Music has HWID 2888. You can convert the GCD to an RGN using RGN_Tool from the Software and Tools section.Code:Please Login or Register to see the links
The firmware has a non-standard layout, where the "boot.bin" (ramloader) would usually be for region 12, it has the bootloader for region 5 as "fw_0505.bin", so i don't know if it will flash as an RGN using Updater.exe. That's the same layout for the fenix 6X Pro in the posts immediately above yours.
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9th June 2026, 02:36 PM #11Garmin/GPS Systems GMod.
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