BEFORE you put the Chromebook into developer mode, the Read/Write screw must be removed from the motherboard. See pictures below.

Picture 1.1

Once the Read/Write Screw is removed, attach the palmrest/keyboard assembly back on, but do not screw it down. You will have to replace the read/write screw once the S/N change is complete. Continue on and follow the steps in order to change the Serial Number of the Device.

Get to developer mode: CTL J4 Chromebook

On this device, both the recovery button and the dev-switch have been virtualized. Our partners don't really like physical switches - they cost money, take up space on the motherboard, and require holes in the case.

To invoke Recovery mode:

• • Plug the DC Power in

• • Hold down the Esc + Refresh + Power until the display turns on then release.

  • At the screen that says the “Chrome OS is missing or damaged”, press Ctrl + D then Enter.

  • At the screen that says “Chrome OS verification is turned off”, press Ctrl + D, the device will restart and progress into developer mode.

  • Do not touch or do anything for 3-5 minutes until it progresses back to the “Chrome OS verification is turned off” screen, then press Ctrl + D

  • Wait until the device boots to the Chrome start screen, Press Ctrl + Alt + → (Ctrl-Alt-F2)

Once in the command prompt continue to the next page, if not in a command prompt retry the above steps.

Once in developer mode: CTL J4 Chromebook

Type as shown below, if it’s Capital leave it Capital, if its lowercase leave it lowercase. Spaces are important make sure if there is a space you type it in the terminal.

• • Type: chronos

    • Press Enter

  • Type: sudo su

    • Space after “sudo”.

    • Press Enter

  • Type: vpd -l (lowercase L)

    • Space after “vpd”.

    • Once you type vpd -l, this will display the current motherboards information including the motherboards current serial number.

    • Press Enter

  • Type: vpd -s “serial_number”=”0000000000”

    • Replace the 000’s with the Device Serial number from the original device.

    • Space after “vpd”, Space after “-s”.

    • Press Enter

    • If flashromPartialWrite() error displays, the read/write screw has not been removed. Remove the screw and restart the process.

  • Type: dump_vpd_log --force

    • Space after “dump_vpd_log”.

    • Press Enter

  • Type: dump_vpd_log --full --stdout

    • Space after “dump_vpd_log”, Space after “--full”.

    • Press Enter

  • You can now type “vpd -l” then Enter to verify that the serial number has changed.

  • Leave the device in developer mode once the repair is completed, so that the QC Team can Verify the SN Change.