During May 2025, Zhenghui Wu focused on improving the power management of the esp-usb repository by addressing a deep sleep leakage issue in the USB HS PHY when using the UTMI PHY. He implemented a solution in C that registers a hook to suppress leakage during deep sleep, enhancing device stability and reducing unnecessary wakeups after USB initialization. Drawing on his expertise in embedded systems, hardware support, and low power modes, Zhenghui’s work improved the reliability of USB subsystem transitions to low-power states. The depth of his contribution is reflected in the targeted fix, which addressed a nuanced hardware power issue.