Asus RS520-X5/PS8 - Manual (Page 49)

ASUS RS520-X5/PS8 4-7
6. Onboard storage setting (3-pin SAS_EN1)
This jumper allows you to enable or disable the onboard LSI1068 SAS
controller. Set the jumper to pins 1-2 to enable the SAS function (default).
7. Force BIOS recovery setting (3-pin RECOVERY1)
This jumper allows you to quickly update or recover the BIOS settings when it
becomes corrupted.
To update the BIOS:
1. Prepare a floppy disk that contains the latest BIOS for the motherboard
and the Phoenix Phlash16 utility. Ensure you download the correct
BIOS for your motherboard model.
2. Set the jumper to pins 2-3.
3. Insert the floppy disk then turn on the system to update the BIOS.
4. Shut down the system.
5. Set the jumper back to pins 1-2.
6. Turn on the system.