I was having the same problem until I reset the Jetpack by taking the battery and sim card out, wait 30 seconds, and then re-install. This will put everything back to factory defaults.
Then I was able to get the new firmware.
Worked for me, give it a shot. -- ... need help? »evdo-tips.com/
After you did the battery and SIM pull did you then connect to the unit using WiFi and download the update from the built-in web portal or did the update just "automagically" show up on the unit?
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