*

Quick hack: Removing the Chromebook Write-Protect screw

Posted on 08/03/2017 by Robert Foss

Before being able to write firmware data to any production Chromebook device, the Write-Protect screw has to be removed.

This post will look specifically at removing the WP screw from a Chell (HP Chromebook 13 G1) device, and verifying that it has been successfully removed.

To actually flash firmware to Chromebook machines, a device called a Servo is needed. While these devices aren't available publicly, they can be produced freely or possibly requested from Google if you are contributing code to the ChromiumOS project.

Removing the Write-Protect screw

WP screw on Chell Chromebook

So this is what the WP screw looks like on a Chell Chromebook. This may or may not be what you will find in other devices. But if you take a close look, you will notice that the copper pad that the the screw attaches against is split into parts that are bridged by a screw being inserted.

Disable Write-Protect

So this is the part that requires a Servo device. And a ChromiumOS checkout, for some help setting one up, have a look at my previous post.

# Go to your ChromiumOS checkout
cd /opt/chromiumos

# Enter dev environment
cros_sdk

# Set device variable
export BOARD=chell

# Connect to Chromebook using a Servo device
sudo servod -b $BOARD &

# Disable WP
# This step may vary depending on the hardware of your actual Chromebook
dut-control fw_wp:off
sudo /usr/sbin/flashrom -p ft2232_spi:type=servo-v2 --wp-disable
sudo /usr/sbin/flashrom -p ec --wp-disable

 

References

ChromiumOS Servo
Setting up a ChromiumOS dev environment

 

Thanks!

This post has been a part of work undertaken by my employer Collabora.

 

Original post

Comments (0)


Add a Comment





Allowed tags: <b><i><br>Add a new comment:


Latest Blog Posts

Collabora contributions to GStreamer 1.12

04/05/2017

Along with the usual load of memory leaks, crashes and other bugs, Collabora's multimedia team once again contributed a number of improvements…

Android: Getting up and running on the iMX6

27/04/2017

Getting Android up and running on the iMX6 platform using an open source graphics stack has been impossible up until recently, but now you…

Receiving an AES67 stream with GStreamer

25/04/2017

With GStreamer you can easily receive a AES67 stream, the standard which allows inter-operability between different IP based audio networking…

Quick hack: Changing the Android boot animation

21/04/2017

If you're looking to change the Android boot animation to something other than the stock one, here's a hands-on guide to help you to do…

GStreamer 1.12: Intel Media SDK support and more

19/04/2017

With GStreamer 1.12's first release candidate out for testing and the final release expected soon, here's a brief preview of some of the…

Tracing the user space and Operating System interactions

10/04/2017

Like the bug that no one can solve, many issues occur on the interface between the user application and the operating system. But even in…

Open Since 2005

We use cookies on this website to ensure that you get the best experience. By continuing to use this website you are consenting to the use of these cookies. To find out more please follow this link.

Collabora Ltd © 2005-2017. All rights reserved. Website sitemap.