On a working chromebook of the same model that you need to recover do the following:

1. Insert a USB drive in the chromebook
2. Type chrome://imageburner in the address bar
3. Run the tool and follow the instructions that appear on your screen

1. Click this link to download the Recovery Tool: https://dl.google.com/dl/edgedl/chromeos/recovery/linux_recovery.sh
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.

1. Click this link to download the Recovery Tool: https://dl.google.com/dl/chromeos/recovery/chromeosimagecreatorV2.exe
2. If you're a network administrator for your school, business, or organization, click this link to download the Recovery Tool: https://dl.google.com/dl/chromeos/recovery/chromeosimagecreator.exe
3. Run the tool and follow the instructions that appear on your screen.
4. After you recover your Chrome device, you must format your USB flash drive or SD card using the Recovery Tool. If you don't format your USB flash drive or SD card, you won’t be able to use all the storage space on your external device. Additionally, your USB flash drive or SD card may not be recognizable by Windows. See instructions for reformatting your USB flash drive or SD card.