Worked on restoring AVAX coin support in the KeystoneHQ/keystone3-firmware project, addressing a regression that had removed AVAX functionality from the wallet. The solution involved carefully reverting a previous commit, re-enabling AVAX in the CoinDealHandler, and updating relevant enumerations and state definitions to ensure seamless wallet operation and market compatibility. This work required detailed firmware-level debugging and precise modification of C code within an embedded development context. By maintaining clear and traceable commit messaging, the developer preserved AVAX support for users, minimized potential disruptions, and contributed to the maintainability and reliability of the firmware codebase.