Worked on the espressif/esp32-wifi-lib repository to deliver a targeted reliability fix for MAC transmission in the ESP32 Wi-Fi library. Addressed an issue where the TX frame ACK bit was not reliably set, which previously led to unnecessary retransmissions and unstable connectivity across ESP32 variants. Utilized embedded systems expertise and low-level firmware development skills, applying bitwise control in embedded C and C++ to align with ESP32 hardware behavior. Validated the solution across multiple device variants, ensuring consistent MAC transmission termination. This work improved Wi-Fi transmission reliability in production environments, demonstrating a methodical approach to debugging and cross-device firmware validation.