Harsimran Singh Tungal developed secure firmware update (FWU) dispatch functionality for the Corstone-1000 platform within the zephyrproject-rtos/trusted-firmware-m repository. He enabled PSA FWU calls to be transmitted securely between Cortex-A and Cortex-M cores by leveraging the RSE-COMMS layer, introducing include directives and permission checks to enforce security throughout the update process. Working primarily in C and applying embedded systems and firmware development expertise, Harsimran established a robust foundation for cross-core firmware update workflows. His work addressed the need for secure, production-ready update mechanisms and ensured traceability, integration readiness, and future extensibility for platform-level firmware updates.