So I have a Pikachu yellow 3ds XL that was updated since getting it, it is on 9.9. My friends black XL is on 9.0 and he broke both screens. So we decided to swap out the motherboards on both systems. And now I have a Pikachu XL with hackable firmware. BUT I recognized a bad side effect of this. When I go into eshop and then settings I tried to delete the eshop account on his XL with my old motherboard. And it asks for a serial number. Strangely enough it does not accept his serial number but only mine. Is this because the motherboard is locked to the console serial number? I am just worried that since he is sellilng his as parts that something will come back to me later. Please if anyone knows about this can you give me insight?