Updating Chrome OS is now possible due to the Chrome OS dev install. A simple explanation as to what this is, when Chrome OS is installed using the script, Chrome OS believes it is in developer mode and allows for you to run restricted developer commands such as shell and sudo etc. This then allows you to run the same Chrome OS install script as originally used to upgrade Chromium OS to Chrome OS. Note: This can be used to upgrade your usb to Chrome OS however these usb devices are very limited on the hardware they will boot on, more so than if you upgrade on a HDD/SDD. Step 1: Confirm that your build has a dev install by entering the terminal (CTL+ALT+T) and entering the command: Shell If the terminal accepts the command and then writing changes colour, then you can proceed to step 2, if not and you get an error message, then your build is not actually a dev install, this would apply to those using a build roughly before 26. To find out your build, go to the help option under settings. If you are running an older build then you will need to start again from the Chromium OS install. Step 2: Open the Dev terminal (CTL+ALT+F2, you may need to hold CTL and alternate pressing ALT and F2). Step 3: Run the command: sudo su Step 4: Log in using 'chronos' as the username, no password should be required, but if so it is 'facepunch'. Step 5: Run the command: bash <(curl -s -L http://goo.gl/8v1ZkV) Step 6: The script will run and automatically find your build and download the relating build and install it over the top. Step 7: allow for Chrome OS to install, you will not actually get a completed message, you will get a time completed message, after it has finished extracting and unpacking etc. It is best to leave this for about 20 minutes just to make sure it has installed all the required components. Step 8: reboot by either a reset button on your computer ( if it has one) or by cutting the power by holding the power button. Note: Once you have rebooted, you may get a screen displaying a message about a kernel boot, this is nothing to worry about, this screen was originally hidden in Chrome OS. Chrome OS will then boot into your newly updates Chrome OS. Step 9: Confirm that the update has completed by viewing help section in the settings. source http://zzsethzz.blogspot.co.uk/p/blog-page_14.html
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