How do I restore access if I lose all my backup cards?

If you lose all the cards in your backup, you will lose access to your funds. Only your cards have access to the wallet. The number of cards in your set (2 or 3) is the number of copies of your private key that exist in the world. This is why we recommend keeping your cards in different places. If one card is lost/stolen, you can buy a new set of cards and transfer the funds to it.