As far as I know, you have it now about the P703 which is a 6 pins ICPS connector and I have no information about that.

As for the TL866II Plus, this has a ICPS port but you need to take a look to the pinout of it.
In any case, the duo seems to have also a another port, the P401
which is a jtag connector but also by this, you need to check at least the vcc and ground pins before you do an attempt to connect it because the connections are often not basic.
But it has as far as I know, there is no use to do that.

The one I gave was the P301 four pins I2C (Jtag) connector.
This is placed between the U807/U804 and can be used with the Cypress board to do an attempt to fix the boot loader of the box.

The schema I have given above are the connections from the TL866II Plus ICSP to the port P301. Would that be possible?

I have connected the P301 to the ICSP port, but if I enter the IC "Samsung chip K9K8G08U0D" in the software I can not select an ICSP port. What other setting options do I have?

The ICPS post of the programmer is not usable for an I2C port.
This programmer port is only usable for ICPS connections and to create a connection, the programmer must have the correct part in the list to work with it.
And I have no idea what can be accessed with the duo2 and the ICPS port, but I think it's used for accessing the cpu, or debugging from it, in any case (I think) not to access the Nand flash chip.

In any case, as far as I known, you can not use this programmer to access the nand flash chip by this method.
You should remove the nand flash chip, and place it directly into the programmer to get access to it.

For the I2C port, you need a I2C programmer, as for example the Cypress board.
This board you can use with the bbs software, and when you have the correct bbs xml script to access the nand chip you should be able to access the nand flash chip.
With the bbs software, you should be able to upload the boot loader (if you have it for the duo2) to bring the box into the state as that you be able to upload an image file on the regulair way, by the usb.

If/When you can get a bbs connection, and if/when you are be able to get contact to the nand flash chip, but you get an error.
Then there may some tricks you could try to complete it.
When that not helps, then you could consider to remove the nand flash chip, and to try to fix it with the programmer, or even to program the nand flash chip with a backup from another duo2 box.

Yes you are right, I will order the Cypress board again because I did not receive the first order. Would the Cypress board with 2 jumpers work as well?

The two jumper version should be working fine as you can see here connected with a vu+ solo2.

Hello,
I got my Cypress board and set up the driver, then connected to the port P301 but the board is not connected, it only indicates "disconnect".
I assume that no connection can be made. Will probably desolder the flash and have to install a new one.

Yeah you need the bbs software for this BCM7424 cpu to make a I2C (Jtag) connection with the cypress board, and that, I do not have.

As for the nand flash chip replacements,
You must program the new nand flash chip before placing it on the board, otherwise it still not works because you can not flash the empty chip by the usb.
For this, you must at least have the correct Cfe file on the chip programmed to bring the usb port flash method back to life.

Thus, you must have a working copy (binaries file) from a working duo2 box and programming it to the new nand flash chip before you place it on the board.

I could help you on a bin file, made from an original duo2 box, which you can use with your nand flash programmer, if you have the socket tsop48 for it.
You need this socket to place the nand flash chip onto your programmer.

Yes it would be great if I could get the bin file. I ordered the Tsop48 Nand adapter 3 weeks ago and I am still waiting for it to arrive.
Is only the binary file, or even the CFE file supposed to be on the Nand flash?

CFE is naturally loaded into the Flash Chip, so I bet it is included (and generally it's on the first Kb as it's the bootloader).

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