Do you have a backup of your unit at some time (any time) before you performed the update?
What updates did you perform?
Answers to those questions will help us decide how to start the process.
Another way to get your current firmware level is to look at the files on your unit with your PC (it looks like just another external hard drive) and review the content of the file called ttgo.bif. It can be opened with any word processor or text editor. We're interested in the line that begins with "ApplicationVersionVersionNumber="
As to backups, a backup of your map is what's critical at this juncture. Look here:
If there are any folders there, we have a map to work with.
If there is a folder there called BACKUP01, you have made a Home backup at some point, and there should be a map there.
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