Obviously you don't have the Full Chip device, I don't know if your interface works with 306/7 - C5 or not, I would advice you to try it on a different Peugeot or Citroen car first. Also, I don't know if adding the resistance would help, but you can try...
If it works with other PSA models but it still does not work with yours, even after adding the resistance, you could try adding all the missing parts. If you search the forums, you will find that some people bought the missing parts and soldered them on their boards.
Failing all that, you could sell it and buy a full chip device.
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