Worked on the zephyrproject-rtos/trusted-firmware-m repository, focusing on enhancing firmware security and reliability in embedded systems. Addressed compliance by enforcing mandatory boot measurements in attestation, introducing explicit error handling and logging when boot records were missing, and aligning the attestation flow with PSA 2.0.0 requirements. Stabilized the attestation test suite by implementing a hard-coded OTP workaround, ensuring continued functionality after the removal of platform-specific attributes while maintaining Attestation HAL API contracts. Used C and CMake to deliver targeted bug fixes, emphasizing traceability, improved test reliability, and robust error reporting within the context of firmware development and security testing.