Lenovo H520e Desktop - Manual (Page 103)

Updating (flashing) the BIOS from your operating system
Note: Because Lenovo makes constant improvements to its Web sites, the Web page contents are subject
to change without notice, including the contents referenced in the following procedure.
To update (flash) the BIOS from your operating system, do the following:
1. Go to http://www.lenovo.com/support.
2. Do the following to locate the downloadable files for your machine type:
a. Click Download & Drivers.
b. In the left pane, click Downloads and drivers.
c. From the Brand drop-down list box, select Desktops.
d. From the Family drop-down list box, select the family name.
e. Click Continue.
f. From the Refine results drop-down list box, select BIOS.
g. Click the BIOS update link.
3. Click the TXT file that contains the instructions for updating (flashing) the BIOS from your operating
system.
4. Print these instructions. This is very important because these instructions will not be displayed on
the screen after the download begins.
5. Follow the printed instructions to download, extract, and install the update.
Recovering from a POST and BIOS update failure
If the power to your computer is interrupted while the POST and BIOS is being updated, your computer
might not restart correctly. If this happens, perform the following procedure to recover from the POST and
BIOS update failure. This procedure is commonly called Boot-block Recovery.
1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Remove the computer cover. See “Removing the computer cover” on page 70.
3. Locate the Clear CMOS /Recovery jumper on the system board. See “Locating parts on the system
board” on page 67.
4. Remove any parts and disconnect any cables that might prevent your access to the Clear CMOS
/Recovery jumper.
5. Move the jumper from the standard position (pin 1 and pin 2) to the maintenance position (pin 2 and
pin 3).
6. Reinstall any parts and reconnect any cables that have been removed or disconnected.
7. Reinstall the computer cover and reconnect the power cords for the computer and monitor. See
“Completing the parts replacement” on page 90.
8. Turn on the computer and then insert the POST and BIOS update (flash update) disc into the optical
drive. Wait a few minutes. Then, the recovery session begins. The recovery session will take two to
three minutes. During this time, a warning message will be displayed and no action is needed from you.
9. After the recovery session is completed, there will be no video, and your computer will automatically
turn off.
10. Repeat step 1 through step 4.
11. Move the jumper back to the standard position (pin 1 and pin 2).
12. Reinstall any parts and reconnect any cables that have been removed or disconnected.
13. Reinstall the computer cover and reconnect power cords and all other external cables. See “Completing
the parts replacement” on page 90.
Chapter 11 . Additional service information 99