First, you need this GCD file. Note, you must have a windows PC, not a mac or a chromebook.
Download it, and save it.. Then next, you need two programs.
garmin cure exe and updater exe.. Y ou can get them both from the dropbox link on this page
Once you have downloaded garmincure exe and updater exe.
Use garmin cure, load the gcd file we downloaded first, then click make firmware.
It will output a rgn file.. Use that rgn file and load it into updater exe.
Next, you h ave to hold the upperleft hand corner of the screen , and then turn on the Dezl while plugging the usb cord into the computer AND you have to watch the updater exe screen and for a split second you will see it flash the DEZL as a USB device.
In that split second you must click ok to start the flash and click ok again to proceed with the flash.
This will work. But its tricky at best to get it going and extremely difficult on your own.
ONCE y ou have done this successfully.. You only have a cure firmware.. To get the dezl workig normally
You now need to download and install the webupdater, and let it update the unit itself to the newest firmware
Here is the link for the web updater http://www8.garmin.com/products/webupdater/howtoinstall.jsp
Once that update is complete, finally you need to disconnect the device, t urn it off and on and reconnect it to the computer.. Then, run the garmin express program and let it update the maps and software one last time.
Now, you have a working unit.
T he process above is tough, and difficult. But IT will work, and it will fix the issue.
best of luck to you, and if you have further questions let me know.
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Senior Technician and Network Switching Systems Operator / Maintainer.