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How to Install Chrome OS on an Old Laptop (Brunch Method)

You can turn an old laptop into a fast ChromeOS device using Brunch, a ChromeOS recovery image, and Rufus to flash the installer. Here’s the precise process:

1. Download a ChromeOS Recovery Image (cros.tech)

Go to https://cros.tech → choose a model like Eve, Hatch, or Samus → click Download Recovery Image.
Extract the .zip file.

2. Download Brunch Framework

Go to the Brunch GitHub page → download the latest Brunch .tar.gz file.
Extract it into the same folder where you extracted the recovery image.

3. Use Ubuntu to Build the ChromeOS Image

Boot into Ubuntu (live USB or installed). Install required tools:

sudo apt update
sudo apt install pv cgpt

Inside the folder containing both the Brunch and recovery files, run the Brunch installer script:

sudo bash chromeos-install.sh -src recovery_image.bin -dst chromeos.img

This generates chromeos.img, a bootable ChromeOS image with Brunch integrated.

4. Flash the Image Using Rufus (Windows)

Copy chromeos.img to your Windows system.
Open Rufus, insert a USB (8GB+), and:

  • Select your USB drive

  • Select chromeos.img as the image

  • Click Start

Rufus will create a bootable ChromeOS USB installer.

5. Install Chrome OS on Your Laptop

Boot from the USB you created.
ChromeOS will load using Brunch. Press Ctrl + Alt + F2, login as root, then run:

chromeos-install

Choose your internal drive → confirm installation → reboot without the USB.

6. First Boot & Setup

ChromeOS will start normally. Sign in with your Google account.
You can adjust Brunch settings later using:

edit-brunch-config

Done

Your old laptop now runs ChromeOS smoothly with modern performance and fast boot times.

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