Try forcing it in to mass storage mode by
Force to Mass Storage -
Turn unit off. Hold the lap/reset button while plugging the unit into the USB. Continue holding the lap/reset for 30 seconds and the unit should go to mass storage.
You could try.
Hold the two buttons down at the bottom and then hold the power button down long enough to force it to restart. This should got you to the end of step 3 below.
Non-prompted Non-Vol Clear - Clears NV and deletes all FIT files including Activities, Courses, Workouts.
- Turn device off
- Hold Lap/Reset and Start/Stop
- Press and release the power button
- Continue to hold only Lap/Reset and Start/Stop
- Release Lap/Reset and Start/Stop when the Garmin Logo is cleared
- The unit will restart and clear non-vol
Would you know what version you were upgrading from?
If you still have the 006B255000.GCD file from the RemoteSw folder could you post it? You will need to zip it or change the file extension as I don't think you can post a GCD file.