More detailed info is needed. Isn't that the "error has occurred" message that appears on boot, when sdnand isn't working as properly? Im only assuming since it is in Japanese and it looks like it.. If you have Hiyacfw installed, and have sdnand set up, and this error message appears only when you try to boot to sdnand then it's not a brick. There are ways to fix this issue, or you could just start from scratch ( don't worry you can backup your DSiWare games, saves etc. before doing that, since you can access them through Unlaunch).how to restore i have a nand backup. please help
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Have you tried: https://dsi.cfw.guide/restoring-nand.htmli don’t know the reasons of brick probably some stupid thing i do anyway i bought a board