Problem “Didn't find PN53x board” Arduino NFC Card Reader
EDIT:
Try using Elechouse library, it worked better for me.



This might be irrelevant, but I wanted to share.

I had a similar issue, not related to the sketch code.

So make sure:


Connect wires to the NFC module at 90 degrees - there should be angular headers included. Also the wires should be above the antenna - the white strip.
There shouldn't be any wires underneath the NFC module or they should on significant distance.
Soldered wires work better on the NFC module.