Display MoreFirst stop kodi (using systemctl stop kodi), then navigate to /storage/.kodi/userdata/Database/ and delete all MyVideosXXX.db / MyMusicXXX.db, ... files with newer versions than the one from LE11 / Kodi Nexus - you may also delete the older database versions and only keep the Nexus ones to save some space.
You can find a list of the database version numbers here: https://kodi.wiki/view/Databases
So keep MyVideos121.db, MyMusic82.db (those are the LE11/Nexus versions), then after the next reboot kodi will migrate those to the newer Kodi Omega versions and you get your state before the LE12 update back.
BTW: It's always a good idea to backup / copy the files somewhere else before permanently deleting them in case you make a mistake
so long,
Hias
Thanks, I was looking for this exact info, I'll try it tomorrow!
I have backup of everything, so there shouldn't be any problem.
Thank you again for you time answering me, I appreciate it!