Hi Mick,
If you also deleted the contents of the User drive during a system/factory reset, the Voices, Styles, Multi Pads, Registration Banks, etc. of the previously installed Expansion Packs will no longer be available on the keyboard. The only solution is to reinstall the Expansion Packs.
If you use the Yamaha Playlists (e.g. the Playlist for the Superior Pack), it should be noted that the respective unzipped folder must be copied directly into the root directory of a USB stick so that the Registration Bank files linked in the Playlist file(s) can be found. (In the User drive or in subfolders on a USB stick it would only work if the file paths to the Registration files in the Playlist files were modified accordingly.
Best regards,
Chris