Preparations
To flash a device using a Freemium edition system image, you need the fastboot tool. You can get the fastboot tool from the platform-tools/ directory in the Android SDK. Be sure that you have the latest version of the Android SDK Platform-tools from the SDK Manager.Once you have the fastboot tool installed, add it to your PATH environment variable (the flash-all script below must be able to find it). If you’re using a Windows machine, be certain that you've set up USB access for your device as described in the Google USB Drivers guide.
Flashing the System Image
Caution: Flashing a new system image deletes all user data. Be certain to first backup any personal data such as photos.
To flash the system image:
Download the appropriate system image for your device below, then unzip it to a safe directory.
Windows users only - open the installation directory and rename the file flash-all to flash-all.bat
Enable OEM Unlock
Go into Settings
Under About Phone, you'll be able to locate your Build Number
Tap Build Number until you are notified that you have activated Developer options
Go into Developer Options, ensure it is enabled and check the Enable OEM Unlock box
Connect your device to your computer over USB.
Start the device in fastboot mode with one of the following methods:
Using a key combo: Turn the device off, then turn it on and immediately hold down the relevant key combination for your device. For example, to put a Nexus 5 ("hammerhead") into fastboot mode, press and hold Volume Up + Volume Down + Power as the device begins booting up.
Using the adb tool: With the device powered on, execute:
adb reboot bootloader
Open a terminal window and navigate to the unzipped system image directory.
Execute the flash-all script. This script installs the necessary bootloader, baseband firmware(s), and operating system.
The target device will show you a confirmation screen. (This erases all data on the target device.)
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