Kernel doesn't affect that, firmware does. Also firmware updates are encrypted and cart-specific. If the website on your cart doesn't offer any firmware update (you need to
RUN firmware updates for them to apply, NOT just put them on the MicroSD!) then you should just get a new flash cart.
http://gbatemp.net/threads/why-was-my-cart-blocked-how-do-i-unblock-it-firmware-update.315784/
http://gbatemp.net/t290097-which-flash-cart-should-i-go I'll just wait to see if gateway is real, to try 3ds roms on my other n3ds (fw :4.5), if it'a a lie, i'll buy supercard dstwo. Thanks for the info Rydian and thanks for responding.