Hi, i just bought a 3ds last year from a gameshop in jakarta, it has Luma3ds Cfw and i really want to uninstall it, i tried the remove the sd card method but the cfw is still there, so please someone help me :3 thanks.

Why do you want to uninstall it? You won't gain anything.

CFW is 100% safe.i want to uninstall becasue i already got games, also i want to play online without getting banned

Running a CFW will not cause your system to get banned from playing online. Even if it did, your system would have been flagged a long time ago and it's actually safer now to keep your CFW, as having that kind of access allows you to unban your 3DS in the unlikely event of your system getting banned. Since you already have a CFW installed, you are better off just pretending it's not there and use the system as normal.i want to uninstall becasue i already got games, also i want to play online without getting banned
