I did that and even when i removed the luma payloads so the chainloader menu doesnt pop up it still just loads luma and home menu which is i nsleepmode unti l iremove the magnet.Does it not work?
I'll go ahead and assume that you held all the right buttons (Start + Select + X) while powering it on. The fact that your 3DS is in sleep mode after booting up regularly at least signals that the magnet sits where it is meant to be placed.
On my device, the blue power indicator LED turns on after a short ~2 second delay when performing ntrboothax (as opposed to immediately when booting normally).
If you end up on your home menu, one of the following is true:
1. You don't have an NDS cartridge in your slot, or B9S-ntr wasn't flashed correctly
2. You weren't holding your buttons properly
3. Misplaced magnet
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I mean that I copied the boot9strap.firm and .sha file to the folder "boot9strap" made on the microsd.
That's for installing boot9strap to your console's firm0 / firm1 partition using SafeB9SInstaller. It's not directly related to ntrboot itself, but you can boot SafeB9SInstaller as a payload after performing ntrboothax.
Make sure you got the latest version of GodMode9.firm as ntrboot.firm, that might fix the "Unsupported Launcher" error, not sure.
Edit: Worth noting, that's a good error because it means that ntrboot most likely worked.