All of the previous settings should be recoverable from an lbprefs file.
The preferences file changed from the time of this post but the camera information ‘should’ be present.
In LightBurn, click File, click Import Prefs and select a file with a date in the filename from when the camera was working well for you. This should return your camera to the working settings.
You may loose recent changes to lasers and equipment but those files should be present as well.
Please let us know if the files are in a directory or folder that is on a file-sharing service OneDrive or Google Drive or if they are stored on an external drive. We have seen data loss with some files on shared or external storage.