Change NFC Shiled Chip Select

[schmron]

@azayed

I set the pins 10 and 4 as ouput and set them to HIGH (I think HIGH is the correct way to get them down and not LOW, according to the Arduino documentation). But anyway I have tried both ways without any success.

Sorry you are right. SS Pin must be HIGH.
Take a look in the ethernet shield schematic. Pin 4 state is controlled via pin 10 state with a logic device.
Google says there is no way to get this combination work…
You can try “bit banging” SPI. Ask Google