During September 2025, Andrey Mudry updated the espressif/esp-usb repository to enhance USB Mass Storage FAT filesystem registration for ESP-IDF 5.3 and newer. He refactored the driver code in C, replacing the legacy esp_vfs_fat_register API with esp_vfs_fat_register_cfg, and introduced conditional compilation to support both host and device implementations across ESP-IDF versions. This approach improved the maintainability and robustness of the embedded system, reducing build-time errors and easing customer upgrades. Andrey’s work focused on driver development and embedded systems, delivering a compatibility-focused feature that aligned the USB MSC stack with evolving ESP-IDF filesystem APIs for forward compatibility.