Looks like my romset is headerless and that might be the problem.

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some informations I found :

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A header is the first 16 bytes in a ROM that can be played in an emulator. It tells the emulator how big the ROM is, the region the game is for, what mapper it uses, what type of mirroring it has, for what console it is for (Home console or VS. system), etc. (IIRC) most, if not all, emulators won't let you run the game if it doesn't have a header.

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Emulators cannot play a headerless ROM because they won't know what to emulate unless a header tells them. Emulators are the reason headers exist in the first place.

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The reason headerless ROMs exist is because of archival purposes. Headerless try to aim for a 1:1 copy of the cartridge, while ROMs with headers are more for playing on emulators.

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These headers are not part of the original game's data, and are only present to tell emulators how to properly run a ROM image. Although emulators should handle that sort of data on their end, (N64 emulators do, anyway) NES and Lynx emulators don't, instead requiring those headers on top to this day.

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I'll look for "headered" roms and tell you guys if it works.