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Nacho Ortiz

Corona v4 4gb - Problem with nand dumper

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Hi, I have a Corona V4 that I want to dump nand. The problem is that it does not detect the sd devic-nand dumper (manufactured from the diagram of sd nand dumper).

I soldered the contacts of the sd card reader directly to the wires. I did not use the sd card and check continuity between the sd card points and the sd card reader pcb points to solder the correct wires.
The crystal is groundede to video output chassis (gnd)

4-6 pads next to nand are not bridged. I have connected the gnd point of the nand dumper with the pad number 6

Resistors rcs6 and 7 are bridged (the pads, because they had no resistance)

I leave images of the installation.

1- https://ibb.co/m9wPJm7

2- https://ibb.co/p26w9j6

3- https://ibb.co/JcZ3RQy

Any help? Thanks very much and sorry for my poor english



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