MAME Full Set Importer for Updated MAME Set?

[Corgan]

Hi, I want to update my MAME Set to a much newer version.

1. Do I simply re-run the Full Set Importer, point LB to the new ROMs, and LB will reference the new ROMs and use the newer version of MAME?
2. What happens to the old ROMs within LB?
3. Will any of my custom playlists (i.e. Favorites) be affected?
4. If I mess this up will the LB backup restore even this kind of step?

[xevious1974]

I have done it last year.

I suggest you to remove all and make a fresh new install.

Updating I had some doubled playlists and some doubled roms

3) Unless you delete your playlists, they remains. But what can change is what inside the playlists.  If you add manually to favourite playlist, it does not change for sure. But if you add what you have marked "favourite" in LB and made the playlist checking the "favourite-true" games...I may suppose that data will be lost. In this case you can remove the actual favourite-true parameter from your playlist and it'll save the games checking the titles you have already in that list.

4) You can do a backup of LB setting. But with a fresh new install you are quite sure to import what you need

[Corgan]

So I ended up going ahead with my idea yesterday before I saw your post, but I think I made the right choice.  Everything was successful and I've not had any problems.  Basically my steps were:

1. Copy the new set into a folder at the same folder level as the previous set (helpful to include the version number - 0.251 - in the folder name)
2. In LB use the "MAME Full Set Importer" tool and point it at the new folder.
3. Tell LB to update your existing MAME emulator (to keep settings I assume) and it will download and install the correct emulator version.
4. I downloaded my assets after the fact and I ended up with a lot of duplicate assets but using the cleanup tool has mostly solved that.

The result is: all playlists appear to be intact.  I was using LB's built in "Favorites" flag to build my Favorites playlist and that transferred just fine.  All other auto-playlists (genre, etc.) are still there and include the additional games I added in this set (previously I did not have a full set).  I did not end up with any duplicate games, so LB was smart enough to recognize that by itself.