Harry Potter can't change the legend card because he didn't find the right place. Because the Harry Potter legend card needs to be redeemed at the designated place, and cannot be redeemed elsewhere. Exchange method:

1, you can go to the library and click on the spell exchange;

2. After selecting the Bluetooth or WIFI connection option, click Start Search;

3. At this time, you will search for players who have turned on the spell exchange search function around you. After searching, a list will appear. Select a player and click Exchange under his avatar;

4. At this time, the other party will be invited. After the other party agrees to apply, even if the connection is successful, you can start to change the card. We will display an interface waiting for confirmation from other wizards.

5. After the connection is successful, the card selection interface will pop up, and both parties will select the card they want to exchange and lock it;

6. After locking, the confirmation interface will pop up. After clicking OK to change the card, both parties can change the card.