If your bios is 1.0, please use below steps to update bios.

1. Insert the bootable USB device that contains the unzipped bios package files. 
2. Boot to USB device, enetr the correct path where the files are stored.
3. Run AMI1 X10SAE3.813
4. System should auto reboot after step 3 completed.
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5. Boot into DOS mode again
6. Maker sure you see the DOS command line, then press"Ctrl+Alt+Del" to reboot.
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7. Press "Del" to enter BIOS setup menu.
8. Set "Me FW Image Re-Flash" to ENABLE under Advanced->PCH-FW Configuration->Firmware Update Configuration page.
9. Save and exit the BIOS
10. Boot to the bootable USB device again.
11. Run AMI2 X10SAE3.813
12. Done