I don't know much about the 3DS's security or how it manages files specifically.sorry to bother you, but there is something i feel strange.
i had found 2 files has exactly 0x00004200 length long, while both of them is a part of the 3ds update file.
So..Rydian i beg you take a look at that >>Can it be any clue? .. If not please let me apologize for my impatient.