Hacking m3i zero won't reflash

[Mechlior]

So tried reflashing my m3i card with the 1.4 f_core and the led blinks once and refuses to work in any DS anymore. Im using a DS Lite and used the same sd card to reflash another m3i and it worked, but it refuses to work in my other one....I already tried researching here and elsewhere and cant figure it out. Any ideas?

edit: i suppose i should mention that before and after any and every ds refused to read my m3 card at all and i tried fixing bad contact issues and they didn't work