How to Install Chromium OS on an Unsupported Notebook or PC After Windows 10 Support Ends in October 2025

As Windows 10 support comes to an end in October 2025, many older notebooks and PCs will no longer receive security updates or support from Microsoft. This doesn't mean these devices need to be retired. Instead, you can give them a new lease on life by installing Chromium OS, a lightweight and efficient operating system based on Google’s Chrome OS.

What is Chromium OS?

Chromium OS is the open-source version of Chrome OS, the operating system that powers Chromebooks. It's designed for speed, simplicity, and security. While Chrome OS is only available on official Google hardware, Chromium OS can be installed on a variety of devices, including those no longer supported by Windows 10.

Why Choose Chromium OS?

  1. Lightweight: Perfect for older hardware, as it requires fewer resources.
  2. Speed: Quick boot times and fast performance.
  3. Security: Regular updates and a secure browsing environment.
  4. Simplicity: A user-friendly interface focused on web applications.

Preparing for Installation

Before you start, ensure you have the following:

  • An older notebook or PC.
  • A USB flash drive with at least 8GB of storage.
  • A second computer (to create the bootable USB drive).
  • A stable internet connection.

Step-by-Step Installation Guide

1. Download Chrome OS Flex

Chrome OS Flex by Google is a version of Chrome OS designed to be installed on a wide range of hardware, including older PCs and Macs. It offers the same core functionality as Chrome OS, providing a smooth, secure, and speedy user experience.

2. Create a Bootable USB Drive

To create a bootable USB drive, follow these steps:

  1. Download the Chrome Recovery Utility:

    • On the Chrome OS Flex download page, download the Chrome Recovery Utility for Windows or Mac.
  2. Create the Bootable USB:

    • Insert your USB flash drive into the second computer.
    • Open the Chrome browser, add the Chrome Recovery Utility extension from the Chrome Web Store.
    • Follow the instructions in the extension to create a bootable Chrome OS Flex USB drive using the downloaded installer.

3. Boot from the USB Drive

Now, you need to boot your older notebook or PC from the USB drive.

  1. Insert the USB Drive:

    • Insert the bootable Chrome OS Flex USB drive into the USB port of your older notebook or PC.
  2. Access the Boot Menu:

    • Power on your device and immediately press the key to access the boot menu (usually F12, ESC, or DEL, depending on the manufacturer).
  3. Select the USB Drive:

    • From the boot menu, select the USB drive to boot from it.

4. Install Chrome OS Flex

Once your device boots from the USB drive, you’ll be taken to the Chrome OS Flex setup screen.

  1. Run Chrome OS Flex:

    • You can try Chrome OS Flex without installing by selecting the “Try it first” option, or proceed directly to installation.
  2. Install Chrome OS Flex:

    • Click on the clock in the bottom right corner and select “Install OS”.
    • Follow the on-screen instructions to install Chrome OS Flex. This process will erase the current contents of your hard drive, so make sure to back up any important data before proceeding.

5. Complete Setup

After the installation process is complete:

  1. Remove the USB Drive:

    • Once the installation is finished, remove the USB drive and restart your device.
  2. Initial Configuration:

    • Your device will boot into Chrome OS Flex. Follow the initial setup instructions to configure your network settings, sign in with your Google account, and complete the setup process.

Post-Installation Tips

  1. Updates:

    • Chrome OS Flex will regularly check for updates. Ensure you keep your system updated for the latest features and security improvements.
  2. Exploring Apps:

    • The Chromium OS ecosystem supports a wide range of web applications available through the Chrome Web Store. You can also use Android apps if your hardware supports it.
  3. Troubleshooting:


By installing Chrome OS Flex on your older notebook or PC, you can extend the life of your hardware and enjoy a secure, fast, and simple operating system. As Windows 10 support ends, making the switch to Chrome OS Flex is a practical and sustainable solution to keep your device running smoothly. Happy computing!