I managed to restore the gamelists from an old backup and at least now i can get to the games listed on the old gamelists, but when I try to update them it simply ignores the files present in the sd card. Sorry but this seems like a bug and I simply can't get it to update. the es log simply says it parses the XML files but it doesn't seem to look for the rom files in the card.
ok you mean /recalbox/share_init/system/.emulationStation/es_systems.cfg
I made a copy in /recalbox/share/system/.emulationstation
but once restarted, i do not get in emulstationmenu/.. advanced options/ mame the choice with two values defined here for instance :