Zhenqiangit worked on restoring AVAX coin support in the KeystoneHQ/keystone3-firmware repository, addressing a regression that had removed AVAX functionality from the wallet. Using C programming and embedded firmware development skills, Zhenqiangit carefully re-enabled AVAX in the CoinDealHandler and updated relevant enumerations and state definitions to ensure seamless wallet operation and market compatibility. The solution involved reverting a previous commit, demonstrating attention to code traceability and maintainability. Although the work focused on a single bug fix rather than new features, it required a deep understanding of firmware architecture and precise modification of coin handling logic to prevent user disruption.