Ledger Firmware Upgrade

In this chapter, Charles Guillemet addresses concerns about the security of Ledger's firmware upgrade, emphasizing that it does not degrade the device's security posture. He explains that the upgrade introduces a new feature that users can choose to use or not, and compares it to adding new applications to the device. David Hoffman also provides a visual explanation of how a ledger works, highlighting the importance of the secure element in safeguarding private keys.