: Use a USB/Type-C cable to connect your engraver to your PC and power it on. MKS Laser Tool and select the "MKS ESP32 Download Tool" Configure Parameters : Select the correct port found in your PC's Device Manager : Typically set to (or 25000 for specific S3 models). Flash Size (for ESP32-S3) or (for standard ESP32). Erase and Flash "Erase Flash" first to clear old data, then select your new firmware file and click