- Make sure you backup any personal data such as photos before applying update.
- Get the latest adb tool from the Android SDK Platform-Tools package.
- Add adb to your PATH environment variable or, as the instructions below assume, change into the directory containing the executable.
- Enable USB debugging for your device as described here.
- Change into the directory containing the adb executable.
- Download the latest OTA image (appropriate for your device) from https://developers.google.com/android/ota into the adb directory.