Updating Glass Operating System

Check if you have the latest version of Glass Enterprise firmware installed on your device here.

An offline copy of the instructions are attached as a PowerPoint presentation at the bottom of this article. 

Requirements

• A Mac, Linux or Windows PC with a USB port
• Internet connection
• A USB cord to connect your Google Glass EE2 device to your computer
• A Google Glass Enterprise Edition 2 device
• Google Chrome (download here)
• Android Developer SDK (download here) or if you have Android Studio (download here), it will be included in the install 

Windows Only

• Download and install the Google OEM USB Driver for Windows. The download is available here and installation instructions are available here.
• If you have Android Studio on your PC, ensure it is not currently running before beginning the firmware update.

Linux Only

• On some Linux systems you may see a connection error on https://flash.google.com. In order to fix this you need to create a udev rule for your device to access the Glass device via USB.

Update Firmware

1. Ensure Developer Options and USB Debugging are enabled.

2. On your PC, navigate to the Glass Enterprise webpage and select Update Firmware.

3. The latest version of Glass firmware is displayed on the top row. Select the Flash link next to the latest version.

4. You may also be prompted to Allow access to the ADB Keys. Select OK.

5. If your device is detected the flash drive will indicate Connected.

If you see No devices available check that USB debugging is still enabled on the device

If the device is still not showing, try selecting Add new device to see if your computer can detect the GGE2 unit.

If it says Auth pending check the Google Glass display to see if the ‘Allow USB Debugging’ prompt has appeared and tap to allow.

If not, disconnect and then reconnect the USB cable to prompt this function and try again.

6. Once detected, select your device and click Install to begin the update.

7.  Select “Confirm” when you are ready to start the update. DO NOT unplug your device or interrupt this process. 

8. You may need to Enable USB Debugging again on the Google Glass device when prompted.

9. The Google Glass device may prompt you to allow a factory reset. Tap to confirm the factory reset.

10. As the device begins the process, it will restart into Fast Boot mode. You may be prompted to find or Reselect device. The device may be called “Android” while in Fast Boot mode.

If prompted, select "Yes" to unlock the device.

After reselecting the device, it should download and install the updated software. 

11. Once complete, you will be prompted to lock the device. Select Start to begin.

You may also be prompted to interact with the Glass device to allow or complete this process. Once complete, the device will restart.

Troubleshooting

• If the updating process is interrupted or cancelled, we recommend checking the version within Glass here.
• If you are unable to use the device after an installation has failed or been interrupted, please restart your computer, and start the update process again from the beginning to confirm that the device has been successfully updated. 

• Restart the Glass EE2 device to bootloader mode by pressing the power and camera buttons simultaneously

• Failing all of the above, flash it via the command line following the instructions here: 

  • If running the commands from step 4 in the above the README.txt fails with fastboot: error: cannot get boot partition size then instead of running fastboot flash boot boot.img from the README.txt run fastboot flash:raw boot boot.img instead