heres and update click on the link http://www8.garmin.com/support/download_details.jsp?id=1921
or try doing this
the local Garmin support rep
and I was given the following sequence to recover from this condition:
1. Power off the unit.
2. HOLD down the power button and you will see "Pre Boot Mode" appear on the lower part of the display. KEEP HOLDING the power button down and the display will flicker, do this until the pre boot mode message disappears. This seems to take a long time (60 seconds at least).
3. Once the pre boot mode message disappears release the power button and your device will perform some activites to recover from the above problem.
Apparently this sequence will only work with the above error. I hope this assists other if they encounter this problem.
I still don't know why the firmware upgrade process failed BUT after performing the above sequence I found that the firmware upgrade had actually worked (strange).