How do I update the BIOS using the Flash BIOS Button?

Download the latest BIOS file from the MSI website that matches your motherboard model, rename it to MSI.ROM, and save it to the root of your USB flash drive. Connect the power supply to CPU_PWR1 and ATX_PWR1 (no need to install CPU and memory), plug the USB drive into the Flash BIOS Port on the rear I/O panel, and press the Flash BIOS Button. The LED will start flashing and turn off when the process completes.