ok, i'll explain a little better what happened
1) I bought my R4i-SDHC V4.5 and it worked perfectly with my 3DS version 4.5
2) A new update for the 3DS comes out (5.0). I did not update the 3DS, instead i tried to update the R4i-SDHC
3) In the R4i-SDHC menu, i go to menu->configuration->upgrade and i started to upgrade the flashcard
4) After the procces is finished, i restarted the console and the fake game from the R4i-SDHC changed (from Bomberman Land Touch to Metroid Prime Hunters Demo Version)
5) I tried to use the R4i-SDHC with the 3DS, but the flashcard is blocked
6) Use the R4i-SDHC with a NDS and it works, but now the version is V4.4 (so i did a downgrade instead of an upgrade)
7) Tried multiple times to upgrade the R4i-SDHC back to V4.5 using the NDS, but nothing works (even using the wifi option, with the wifi option it upgrades to 1.67b but the fake game is still Metroid Prime Hunters Demo Version). If you see the first picture i posted, there's no option to upgrade.