I heard it is the 2013 model (i.e 2nd Gen).
Here's what you need: (All of this is from Furbitchi),
Link to app: https://takuragotchi.tumblr.com/post/98546070752/tamagotchi-4u-app
What you need to do: (i find it more helpful looking at YouTube vids)
Ensure NFC is enabled
Wifi or mobile data...