Hacking Problem hardmod old 3ds

[Entyum]

Hi guys. First sorry for my english!
I use this tutorial tutorial noob friendly nand dumping and a video on youtube (in this video GND wire is on de game card reader and not under but he can do all the process anyways)

All is fine and i get this errorcode: 00F800FE 000.... 00000400 But my pc doesnt recognize the 3ds (i mean i see the usb connected in devide administrator but that is all) and obviously win32diskimager neither

i follow this for solder wires on sd card:

Also i use this sd card reader :Transcend P8 TS-RDP8K So that is not the problem! And sd card is kingston

What can i do? Thanks!