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I did this as I read some other comments that the Garmin webupdater application has (in some cases) caused corruption.
I ran the firmware update as per the instructions from the Garmin website and two files copied to the unit but the third file (I can't recall the extension) failed to copy with a file in use error.
I could not work out a way to recover from this as the upgrade failed (not fully complete) and the only option was to reset the unit via the power button.