MCV won't upgrade

I get the following message when I try to upgrade to the newer version:
Update failed! Unable to upload your config files to the server. Please Save a Backup manually and then try again with Restore to factory defaults

I’ve saved a backup and restored to factory defaults, yet this message still comes up.

What can I take a look at, or try?

Thanks.

Please enable tech support and submit a trouble ticket with the logs so we can check your unit and see exactly what happens.

Thanks!

Thank you! I’ve just enabled tech support.