I want to know how to remove a9lh and luma on my old3dsxl because I want to sell it to gamestop. I do not have sdcardless a9lh and just sd card only a9lh. Would it be best to install my old nand backup using decrypt 9 or uninstall using safe a9lh installer. Is that all I have to do or do I have to do something else? Thanks in advance.