Developed a security-focused feature for the tianocore/edk2 repository, enhancing Trusted Execution Environment lock-down readiness by implementing a protocol notification path in the ArmPkg module. The work involved installing the gEfiMmReadyToLockProtocolGuid within the Mm phase upon notification, enabling earlier and more reliable secure-state transitions during secure boot and lock-down procedures. This approach reduced risk during state transitions and improved the maintainability of lock-down readiness logic. Leveraging expertise in driver development, embedded systems, and UEFI development, the solution was delivered in C with a clear, minimal code change that strengthened the security posture of the platform.