8.Follow the instructions on the screen to complete the update.

Updating (flashing) BIOS from your operating system

Note: Due to constant improvements being made to the Web site, Web page content (including the links referenced in the following procedure) is subject to change.

1.From your browser, type http://www.lenovo.com/support in the address field and press Enter.

2.Locate the Downloadable files for your machine type as follows:

a.Under Use Quick path, type your machine type and click Go.

b.Click Continue.

c.Click Downloads and drivers.

d.Under the BIOS category, click the Flash BIOS update.

e.Click the .txt file that contains the installation instructions for the flash BIOS update (flash from the operating system version).

3.Print these instructions. This is very important since they are not on the screen after the download begins.

4.From your browser, click Back to return to the list of files. Carefully follow the printed instructions to download, extract, and install the update.

Recovering from a POST/BIOS update failure

If power to your computer is interrupted while POST/BIOS is being updated (flash update), your computer might not restart correctly. If this happens, perform the following procedure commonly called Boot-block Recovery.

1.Turn off the computer and any attached devices, such as printers, monitors, and external drives.

2.Unplug all power cords from electrical outlets, and open the computer cover. See “Opening the cover” on page 20

3.Access the system board. See “Accessing system board components and drives” on page 22.

4.Locate the Clear CMOS/Recovery jumper on the system board. See “Identifying parts on the system board” on page 23.

5.Remove any cables that impede access to the Clear CMOS/Recovery jumper.

6.Move the jumper from the standard position (pins 1 and 2) to pins 2 and 3.

7.Reinstall the PCI riser assembly if removed.

8.Close the computer cover and reconnect any cables that were disconnected. See “Closing the cover and connecting the cables” on page 35.

9.Reconnect the power cords for the computer and monitor to electrical outlets.

10.Insert the POST/BIOS update (flash) diskette into drive A, and turn on the computer and the monitor.

11.The recovery session will take two to three minutes. During this time you will hear a series of beeps. After the update session is completed, there will be no video, the series of beeps will end, and the system will automatically turn off. Remove the diskette from the diskette drive.

12.Repeat steps 2 through 5.

13.Replace the Clear CMOS/Recovery jumper to its original position.

14.Reinstall the PCI riser assembly if removed.

50User Guide

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Lenovo 9644, 9638, 9643, 9645 Updating flashing Bios from your operating system, Recovering from a POST/BIOS update failure
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TC A55-9636, 9640, 9645, 9644, 9643 specifications

Lenovo has consistently been at the forefront of innovation in the computing world, with a range of laptops and desktops that cater to a variety of needs and preferences. Among their popular offerings are the Lenovo 9640, 9643, TC A55-9636, 9644, and 9645. Each of these models is designed to provide exceptional performance, reliability, and user-friendly experience, making them appealing choices for both personal and business use.

The Lenovo 9640 is renowned for its sleek design and powerful performance. This model is equipped with the latest Intel processors, ensuring smooth multitasking and efficient power consumption. It features a vibrant display that provides excellent color accuracy and vivid visuals, making it ideal for content creators and casual users alike. With ample storage options and high-speed SSD configurations, users can expect fast boot times and quick file access.

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The TC A55-9636 is Lenovo's entry into the compact desktop market, designed for users seeking a powerful, space-saving solution. With its robust performance metrics and energy-efficient components, the A55-9636 is perfect for both home and office environments. It supports a variety of multitasking scenarios, making it suitable for productivity-driven tasks, while its expandable architecture means users can upgrade components as their needs evolve.

The Lenovo 9644 and 9645 round out this impressive lineup with their focus on business-centric features. These models provide enhanced security options, including fingerprint readers and TPM chips, catering to enterprises that prioritize data protection. With long battery life and solid build quality, both models promise durability and reliability, critical for professionals who are always on the go.

All models in this series showcase Lenovo's commitment to sustainability, incorporating eco-friendly materials and energy-efficient technologies. The user-friendly interfaces across the devices ensure a seamless experience, meeting the demands of a broad user base from students to business executives. In summary, the Lenovo 9640, 9643, TC A55-9636, 9644, and 9645 represent a versatile range of computing solutions that combine cutting-edge technology with efficiency, ensuring users can achieve their goals effectively and stylishly.
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