Troubleshooting

Throughout this guide you have been editing vital product data (vpd) entries. Each entry is composed of what are known as “keys” mapped to “values”. The key portion is the first part of each entry and is always enclosed in parenthesis.

Deleting a line from the VPD list:

If you enter in a line item wrong and it adds a new row to the VPD list there is a way to remove it, example below:

• • vpd -s “Product_SN”=”00000000000”

    • The “Product_SN” is wrong because it is missing the / between the S N

  • If you enter this in wrong it will add a new line to the vpd list.

  • To delete this wrong line you have to use vpd -d “XXXXX”

    • The XXXXX will be the first part of the line for example:

      • If you entered in wrong “Product_SN”=”000000000”

    • Then to delete you enter: vpd -d “Product_SN”

      • This will delete this line from the vpd list.

Developer Mode Always ON:

Sometimes, you will come across a Chromebook that is in developer mode and it cannot be put back into normal mode no matter what you do.

To remedy this, start off as you normally would when changing a serial number:

• • Wait for the Chromebook to finish booting then press Ctrl+Alt+[F2](Refresh).

  • Login as chronos

  • Escalate Privileges with sudo su

  • Run /usr/share/vboot/bin/set_gbb_flags.sh 0x80

    • If command fails due to Write Protection, take steps for that device to disable write-protection.

  • Type reboot to...reboot….

Wont go to the command prompt, once in developer mode:

When you click Ctrl + Alt + → the command prompt shows up for a split second and returns to the home screen?

To Fix this:

• • Press Ctrl + Alt + ←

  • Then try Ctrl + Alt + → again. It should fix this issue.

Remove Device Enrollment:

• If you see the field labeled: "stable_device_secret_DO_NOT_SHARE" You will need to delete this line to remove the device enrollment.

  • Type: vpd -d “stable_device_secret_DO_NOT_SHARE”

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

  • Press Enter