5.When prompted to change the machine type and model, it is suggested that you do not make this change by pressing N. However, if you do want to change the machine type and model, press Y, then type in the machine type and model and press Enter.

6.Follow the instructions on the screen to complete the update. After the update is completed, remove the disc from the optical drive.

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.In the Enter a product number field, type your machine type and click Go.

b.Click Downloads and drivers.

c.Select BIOS from the Refine results drop-down list box to easily locate all the BIOS related links.

d.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, which 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 14.

3.Locate the Clear CMOS /Recovery jumper on the system board. See “Locating parts on the system board” on page 9.

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 43.

8.Turn on the computer and then insert the POST and BIOS update (flash update) disc into the optical drive. The recovery session begins. The recovery session will take two to three minutes. During this time, you will hear a series of beeps.

9.After the recovery session is completed, there will be no video, the series of beeps will end, and the system 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).

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Lenovo 7548, 104, 154 Updating flashing the Bios from your operating system, Recovering from a Post and Bios update failure
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7539, 154, 7548, 104 specifications

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