Upgrading Kodi 15.2 to 17.1

Hi everyone,

I am running Kodi 15.2 with a central mysql database on my NAS, and streaming of shares on the same NAS. It all works fine but I would like to move to the latest version of Kodi.

When I upgrade to 17.1 when Kodi starts it states its converting the database but after it starts there is no information about any of the movies or TV Series, although the file list under videos is still there.

Do I need to perform any upgrades to specific version to perform gradual database upgrades? Or just need to do something else?

Any help appreciated.

Many thanks