That was to be my next and final suggestion, to use modded boot.bin as an RGN to execute update.txt via Updater.exe in preboot. That method to flash it using GarminCure3.exe to invoke Updater.exe is fine and has same result as loading the RGN directly into Updater.exe itself.
Unfortunately i can't access your Google Drive link, it denies access. Please just advise what it says in the log file after " Parsing "xrgn,14,1:/14.bin" ". If it says 'Error' it's non-recoverable. Even if it says 'Success' but still bootloops it's still a goner because there's no further software fixes to try. Only if it was 'Success' message and then stuck on logo with no bootloop and MSM accessible could we carry on.
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