@Lokki Hey, thanks for getting back to me. I'm using the recomended library by Elechouse (on github under elechouse/PN532) together with included NDEF library. I also tried Don's NDEF library, but I think they're the same.

Hey guys, need your help with similar problem as discussed earlier. My PN532 NFC module V3 won't work in I2C mode. I've switched the switch to correct possition, I've tried with both 3.3V and 5V. The module is powered (LED is on). When everything is connected, the COMM manager only says "Hello" and nothing else. If I disconnect one of the cables, it will say "Didn't find PN53x board". I have changed the initial "elif" statement, as written in the handbook, so it will work in I2C mode. However, I still can't get past the "Hello".
Any suggestions?
Many thanks ;)