I just forgot the error code of it. It's not 002-0102 but another unique code. Injecting movable.sed to another 3DS without official System Transfer causes this happen. And seriously the network blocking & the error code still happen even you format the NAND movable.sed injected. I don't know if CTRNAND transfer causes this. But if it does & you lose your NANDmin.bin, your console's network access will be over.