Dell Chromebook 11 3180 Disassembly and Reassembly Guide - For use by Certifie - Page 67

Reinstall the Chrome Operating System, Chrome OS verification is turned off Message

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Table 18. USB flash drive or SD card (continued) Operating System Linux Instructions Instructions After the process is complete, you might see an alert saying your USB drive or SD card is unreadable. If this fails, try removing and reinserting your USB drive or SD card. Your USB drive or SD card should now be ready to use for recovery. Create a recovery flash drive by using the Recovery Tool. The tool may not be available in all languages. 1. 1.Click this link to download the Recovery Tool. 2. Modify the script permissions to allow execution with the following command: $ & sudo chmod 755 linux_recovery.sh 3. Run the script with root privileges with the following command:$ sudo bash linux_recovery.sh 4. Follow the prompts from the tool to complete building the operating system image. Reinstall the Chrome Operating System 1. Start your Chromebook. 2. When the Chrome OS is missing or damaged screen appears, insert the USB flash drive or SD card you created into the USB port or SD card slot on your Chrome device 3. Wait for the Chromebook to boot up from the flash drive 4. Follow the instructions that appear on the screen. 5. On successful installation of the Chrome operating system, you will be prompted to remove the USB flash drive or SD card. 6. Remove the USB flash drive or SD card when prompted, and your Chromebook will automatically restart. You should now be able to start your Chromebook as normal. Because the data stored on your Chromebook has been cleared, you will need to go through the initial setup again. Make sure you sign in with your primary Google Account, because this account will be set as the owner account. Chrome OS verification is turned off Message By default, Chromebooks are set to the normal user mode. If you've set the user mode to developer mode instead, you'll see a screen with the message "Chrome OS verification is turned off" when you start up. Use the developer mode if you want to test your own version of the Chrome operating system. Press Ctrl+D to enter developer mode. If you press the space bar instead, you'll see a screen asking to recover your device. Troubleshooting Tips Table 19. Troubleshooting tips Question I am unable to recover my Chromebook An error message An unexpected error has occurred. An error message You are using an out-of-date Chrome OS recovery image. Solution To help ensure that you are running the latest version of Chrome OS once you recover your Chromebook, we recommend creating the recovery media with the latest version of Chrome OS and avoid using recovery media that may contain an older version of the operating system. Try the following steps: 1. Confirm that you successfully completed all instructions exactly as specified in Step 2: Create the recovery USB flash drive or SD card above. 2. Try using a different USB stick or SD card. 3. If the problem persists, contact Google Chrome support team. You should download an up-to date recovery image. Simply follow all the instructions exactly as specified in Step 2 above. Diagnostic and troubleshooting 67

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Table 18. USB flash drive or SD card (continued)
Operating System
Instructions
After the process is complete, you might see an alert saying your
USB drive or SD card is unreadable. If this fails, try removing and
reinserting your USB drive or SD card. Your USB drive or SD card
should now be ready to use for recovery.
Linux Instructions
Create a recovery flash drive by using the Recovery Tool. The tool
may not be available in all languages.
1.
1.Click this
link
to download the Recovery Tool.
2.
Modify the script permissions to allow execution with the
following command:
$ & sudo chmod 755
linux_recovery.sh
3.
Run the script with root privileges with the following
command:
$ sudo bash linux_recovery.sh
4.
Follow the prompts from the tool to complete building the
operating system image.
Reinstall the Chrome Operating System
1.
Start your Chromebook.
2.
When the
Chrome OS is missing or damaged
screen appears, insert the USB flash drive or SD card you created into the USB port
or SD card slot on your Chrome device
3.
Wait for the Chromebook to boot up from the flash drive
4.
Follow the instructions that appear on the screen.
5.
On successful installation of the Chrome operating system, you will be prompted to remove the USB flash drive or SD card.
6.
Remove the USB flash drive or SD card when prompted, and your Chromebook will automatically restart.
You should now be able to start your Chromebook as normal. Because the data stored on your Chromebook has been cleared, you will
need to go through the initial setup again. Make sure you sign in with your primary Google Account, because this account will be set as the
owner account.
Chrome OS verification is turned off Message
By default, Chromebooks are set to the normal user mode. If you've set the user mode to developer mode instead, you'll see a screen with
the message "Chrome OS verification is turned off" when you start up. Use the developer mode if you want to test your own version of
the Chrome operating system.
Press
Ctrl+D
to enter developer mode. If you press the space bar instead, you'll see a screen asking to recover your device.
Troubleshooting Tips
Table 19. Troubleshooting tips
Question
Solution
I am unable to recover my Chromebook
To help ensure that you are running the latest version of Chrome
OS once you recover your Chromebook, we recommend creating
the recovery media with the latest version of Chrome OS and
avoid using recovery media that may contain an older version of
the operating system.
An error message
An unexpected error has occurred.
Try the following steps:
1.
Confirm that you successfully completed all instructions exactly
as specified in Step 2: Create the recovery USB flash drive or
SD card above.
2.
Try using a different USB stick or SD card.
3.
If the problem persists, contact Google Chrome support team.
An error message
You are using an out-of-date Chrome OS
recovery image.
You should download an up-to date recovery image. Simply follow
all the instructions exactly as specified in Step 2 above.
Diagnostic and troubleshooting
67