The Chromebook will need to be deprovisioned so you can enter Developer mode.
Enter Dev Mode:
This will wipe your local data, so make sure to back anything up that you don't have stored in the cloud. To put your Chromebook in Developer Mode:
- Press and hold the Esc and Refresh keys together, then press the Power button (while still holding the other two keys). This will reboot your Chromebook into Recovery Mode.
- As soon as you see Recovery Mode pop up—the screen with the yellow exclamation point—press Ctrl+D. This will bring up a prompt asking if you want to turn on Developer Mode.
- Press Enter to continue.
- Press Ctrl+D - give it some time. It'll pop up with a new screen for a few moments, then reboot and go through the process of enabling Developer Mode. This may take a little while (about 15 minutes) and will wipe your local information.
- When it's done, it will return to the screen with the red exclamation point. Leave it alone until it reboots into Chrome OS.
Serial Change Steps:
- Disconnect the Battery on all new models (Older Models NL6/NL61/J41/J5/CBx1 Remove the RW screw from the motherboard)
- After it boots into developer mode, press CTR+ALT+F2 the key, this should open a terminal
- In the terminal type "chronos"
- Then "sudo su"
- Then "vpd -l"
On the displayed list you are looking for "serial_number"
To change the entry do the following:
vpd -s "serial_number"="enter your preferred serial"
After that type:
Then verify that the serial numbers have changed by typing "vpd -l" again
Then reboot the chromebook by pressing REF+POW