Chromium OS

Chromium OS is an open-source project that aims to build an operating system that provides a fast, simple, and more secure computing experience for people who spend most of their time on the web.

All downloads are located at This will be updated daily where builds compile succcessfully..

Build Instructions for USB

  • Linux
    1. Use p7zip to extract the IMG file from the downloaded file.
    2. At the shell, run the following (where sdX is your USB stick and ChromeOS.img is the path to the IMG file you extracted):
      dd if=ChromeOS.img of=/dev/sdX bs=4M
    3. Boot from USB stick
  • Windows
    1. Use 7zip to extract IMG file from the downloaded file.
    2. Use Win32 Image Writer, then select the IMG file and select the USB device from the menu.
    3. Click on “Write”.
    4. Boot from USB stick

All builds based on x86, amd64 and ARM generic board.

If you want to install to your hard drive, follow the instructions here and here. Heed the warnings noted in the links!

Please note: there is a new behaviour with the chronos user password. The password has been removed from build R55-8777 onward and will continue to be removed for better overall security. Older builds have the password of ‘password’.
This means you need to use ‘chromeos-setdevpasswd’ from either shell or console to set your own password from build R55-8777 onwards.

By default, this also disables SSH access so if you also need this level of access, you will need to set a separate password using ‘sudo passwd chronos’. This allows the password for dev access and SSH access to remain separate if needed.

You can also just set a password using ‘sudo passwd chronos’ and this will allow for both dev and SSH access if you need to keep them the same. Do not use ‘chromeos-setdevpasswd’ if you want to keep the passwords the same.

Once installed, you can update from the Dev Server noted here.

Thanks to The Chromium Projects


2,299 thoughts on “Chromium OS”

  1. Hi Arnold,

    I’m on an Asus zenbook 3 and the keyboard led is not turning on with either fn and f7 or alt and f7. Am I missing anything? I can sudo cat /sys/class/intel_backlight/Asus::kdb_led to force it on.

    Thank you


  2. Hi Arnold,

    I am having issues setting up WiFi on a Dell Latitude E5470 notebook which features the Intel AC-8260 WLAN chipset.

    running ‘dmesg | grep iwlwifi’ in a tty2 returns log entries indicating failure to load ucode (ENOENT). Yet when I check the existence of the ‘.ucode’ files in /lib/firmware I can see the


    Any clue please?

    Thank you,


  3. How do I turn it in developer mode? ESC + Refresh (f3) + Power is not working. Also enabling debugging features keeps failing.

      1. this works when booting from USB,
        but once i run `chromeos-install –dst /dev/sdb` it installs & boots fine from sdb..however, crosh doesn’t expose the ‘shell’-cmd anymore..its not in developer mode anymore :/
        Any advice?

  4. Hey Arnold,

    I’m having issues getting your images to boot on an older HP Pavilion desktop. I’ve narrowed it down to either the image being a UEFI image or the fact that it formats the drive to have a GPT partition table as opposed to MBR. On this particular computer, it won’t even boot past the HP splash screen. Any way you could help with this?

    1. Update: I flashed Ubuntu 17.04 to the flash drive I was using, and it worked just fine, so the problem isn’t with my flash drive or the way I’m flashing it.

    2. Try a different USB drive and/or different image writing software as some computers I found wont boot with some combinations! I have had problems none EFI booting. In one case boot started but stopped after 2 seconds and yesterday an image would not start to boot but worked in a newer EFI laptop it booted OK. I suspected the USB drive but Windows 10 image booted on all computers I tried. I usually use Win32image writer but have been using Etcher but writing the zip file did not work but unziping first did boot.

  5. Hey man, I’ve a question… It is possible to use the same flash drive with most than one computer without lose my google account configurations? I usually use my flash drive in public computers and everytime I log in I’ve to configure language and stuff…

  6. Hi, I am new to Chromium (and to this Chromium). I did what is described to install but when booting from USB, I kept ended up to my BIOS setup each time. I eventually figured out the EFI folder in the System Partition is empty. I am using Windows32DiskImager to burn on to USB drive. Any help as to what I am doing wrong would be appreciated.

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