If you enter an incorrect or invalid PIN code three times in a row, your Lockbox hardware wallet will reset to factory settings. This will erase all information, including addresses and private keys, from the device.
If this happens to you, or if you forget your PIN code, you will need to use your 24-word recovery phrase in order to restore access to your funds. This article describes how to recover a Lockbox wallet.
You will be prompted to set a new PIN code during the recovery process.