If you brick you could try getting a replacement since your 3ds clearly came defective.Because I hardbricked my o3ds even following all the instructions perfectly. I bought another o3dsxl, so I got an update out of the brick, but it arrives monday and I am debating back and forth in my head if I should even try again.
The sysupdater is much more stable now than the original one I bricked with, but my wife would kill me if I happened to brick another hehe.