Hey, I have to send my N3DS in since the c-stick is completely unresponsive. Is it enough to format my SD to remove Reinand and MSET exploid?
And just to be sure, OP, get the nand mod done after having sent it in to NintendoAssuming you haven't messed with your sysnand other than for the MSET exploit, formatting sysnand should be enough. Don't send them your SD card.
Edit: Your sysnand will be updated, so you have to get a nand mod to restore it.