A red X is often caused by an improper disconnect of the unit from the computer before all data got written to flash memory.
Did you by any chance make a complete Explorer, not Home, backup prior to doing any updating?
Did you try all the suggestions
found here?
Are you trying to make the backup using Explorer.....if not, do so. Ensure hiddenfiles/folders are showing.
If that is successful, (and use Explorer to make sure the specific map folder and contents were copied), then you can delete the loose files in the root of the unit but NO folders or their contents.
Then, with the unit connected, start Home. It should offer to download and install the application. Accept it and let it install. If that works, disconnect the unit PROPERLY using Home's Menu Device-->Disconnect.
If all appears ok, make another Explorer backup to a different folder on the computer.