Ok, the steps below assume you have a windows PC.. If you have a mac, let me know as these steps wont apply.
first thing to do Is close garmin express. Then connect the garmin to your computer.
Then, hold down the windows key on your keyboard and press R, type in %appdata% and hit enter.
Now, in the appdata local and appdata roaming screens, we need to delete anything that is garmin related.
Then, go to this folder %temp%\img delete the img folder
Next, click this pc, you should see the garmin listed as a drive.. We need to open it, and then locate and delete this file inside the garmin if its present
Then, instead of garmin express, lets try an alternate program.
Download install and run the garmin webupdater
Let me know if that will successfully update your garmin, or if it gets stuck too.
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Senior Technician and Network Switching Systems Operator / Maintainer.