During January 2026, Haici Li focused on enhancing the ghost sensor host firmware in the VEXU_GHOST repository. Li reworked the REPL and serial handling logic, introducing a boot-time REPL disable mechanism via boot.py to streamline startup and communication. After evaluating the impact, Li removed boot.py and refactored the serial handling code, resulting in a more maintainable and modular firmware structure. The work emphasized Python and embedded systems skills, with attention to firmware development best practices. Although no bugs were fixed during this period, Li’s efforts improved startup reliability and simplified the codebase, supporting faster deployments and easier future maintenance.