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 <p>This page provides details for running builds on specific devices and is
 designed to complement the information in
 <a href="/source/building.html">Building the System</a>.</p>

 <h2 id="building-fastboot-and-adb">Building fastboot and adb</h2>
 <p>If you don't already have fastboot and adb, you can build them with the
 regular build system. Use the instructions in
 <a href="/source/building.html">Building a System</a> and replace the
 main <code>make</code> command with:</p>
 <pre class="devsite-terminal devsite-click-to-copy">
 make fastboot adb
 </pre>

 <h2 id="booting-into-fastboot-mode">Booting into fastboot mode</h2>
 <p><em>Fastboot</em> is a bootloader mode in which you can flash a device.
 During a cold boot of a device, use the following key combinations to boot into
 fastboot mode:</p>
 <table>
 <thead>
 <tr>
 <th>Codename</th>
 <th>Device</th>
 <th>Keys</th>
 </tr>
 </thead>
 <tbody>
 <tr>
 <td>marlin</td><td>Pixel XL</td>
 <td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>sailfish</td>
 <td>Pixel</td>
 <td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>hikey</td>
 <td>hikey</td>
 <td>Link pins 1 - 2 and 5 - 6 of J15</td>
 </tr>
 <tr>
 <td>angler</td>
 <td>Nexus 6P</td>
 <td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>bullhead</td>
 <td>Nexus 5X</td>
 <td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>shamu</td>
 <td>Nexus 6</td>
 <td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>fugu</td>
 <td>Nexus Player</td>
 <td>Press and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>volantis</td>
 <td>Nexus 9</td>
 <td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>hammerhead</td>
 <td>Nexus 5</td>
 <td>Press and hold both <em>Volume Up</em> and <em>Volume Down</em>, then press
 and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>flo</td>
 <td>Nexus 7</td>
 <td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>deb</td>
 <td>Nexus 7 3G</td>
 <td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>manta</td>
 <td>Nexus 10</td>
 <td>Press and hold both <em>Volume Up</em> and <em>Volume Down</em>, then press
 and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>mako</td>
 <td>Nexus 4</td>
 <td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>grouper</td>
 <td>Nexus 7 (2012)</td>
 <td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>tilapia</td>
 <td>Nexus 7 3G (2012)</td>
 <td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>phantasm</td>
 <td>Nexus Q</td>
 <td>Power the device, cover it with one hand after the LEDs light up and until
 they turn red</td>
 </tr>
 <tr>
 <td>maguro</td>
 <td>Galaxy Nexus GSM</td>
 <td>Press and hold both <em>Volume Up</em> and <em>Volume Down</em>, then press
 and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>toro</td>
 <td>Galaxy Nexus (Verizon)</td>
 <td>Press and hold both <em>Volume Up</em> and <em>Volume Down</em>, then press
 and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>toroplus</td>
 <td>Galaxy Nexus (Sprint)</td>
 <td>Press and hold both <em>Volume Up</em> and <em>Volume Down</em>, then press
 and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>wingray</td>
 <td>Motorola Xoom</td>
 <td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>crespo</td>
 <td>Nexus S</td>
 <td>Press and hold <em>Volume Up</em>, then press and hold <em>Power</em></td>
 </tr>
 <tr>
 <td>crespo4g</td>
 <td>Nexus SG</td>
 <td>Press and hold <em>Volume Up</em>, then press and hold <em>Power</em></td>
 </tr>
 </tbody>
 </table>
 <p>You can also use the command <code>adb reboot bootloader</code> to reboot
 from Android directly into the bootloader with no key combinations.</p>

 <h2 id="unlocking-the-bootloader">Unlocking the bootloader</h2>

 <p>You can flash a custom system only if the bootloader allows it, and the
 bootloader is locked by default. You can unlock the bootloader, but doing so
 deletes user data for privacy reasons. After unlocking, <em>all</em> data on the
 device is erased, i.e. both application private data and shared data accessible
 over USB (including photos and movies). Before attempting to unlock the
 bootloader, be sure to back up any important files on the device.</p>

 <p>You need to unlock the bootloader only once, and you can re-lock it if
 necessary.</p>

 <h3>Unlocking recent devices</h3>
 <p>All Nexus and Pixel devices released since 2014 (starting with Nexus 6 and
 Nexus 9) have factory reset protection and require a multi-step process to
 unlock the bootloader.</p>

 <ol>
   <li>Enable OEM unlocking on the device:
     <ol style="list-style-type:lower-alpha">
       <li>In Settings, tap <strong>About phone</strong>, then tap <strong>Build number</strong> seven (7) times.</li>
       <li>When you see the message "You are a developer", tap the back button.</li>
       <li>Tap <strong>Developer options</strong> and enable <strong>OEM unlocking</strong> and <strong>USB debugging</strong>. (If OEM unlocking is disabled, connect to the Internet so the device can check in at least once. If it remains disabled, your device may be SIM locked by your carrier and the bootloader cannot be unlocked.)</li>
     </ol>
   </li>
   <li>Reboot into the bootloader and use fastboot to unlock it.
     <ul>
       <li>For new devices (2015 and later):
 <pre class="devsite-terminal devsite-click-to-copy">
 fastboot flashing unlock
 </pre>
       </li>
       <li>For older devices (2014 and earlier):
 <pre class="devsite-terminal devsite-click-to-copy">
 fastboot oem unlock
 </pre>
       </li>
     </ul>
     You must confirm the unlock onscreen.
   </li>
 </ol>

 <p class="note"><strong>Note:</strong> On Nexus 10, after unlocking the
 bootloader, the internal storage remains unformatted. You can format the device
 using <code>fastboot format cache</code> followed by <code>fastboot format userdata</code></p>

 <h3 id="relocking-the-bootloader">Re-locking the bootloader</h3>
 <p>To re-lock the bootloader:</p>
 <ul>
   <li>For new devices (2015 and later):
 <pre class="devsite-terminal devsite-click-to-copy">
 fastboot flashing lock
 </pre>
   </li>
   <li>For older devices (2014 and earlier):
 <pre class="devsite-terminal devsite-click-to-copy">
 fastboot oem lock
 </pre>
   </li>
 </ul>

 <p class="note"><strong>Note</strong>: Re-locking the bootloading on a Motorola
 Xoom erases user data (including the shared USB data).</p>

 <h2 id="flash-unlock">Using Flash Unlock</h2>

 <p>Android 7.0 includes a new system API, <code>getFlashLockState()</code>, to
 transmit bootloader state, as well as the following system API that returns the
 bootloader’s lock status on compliant devices:</p>

 <pre>
 PersistentDataBlockManager.getFlashLockState()
 </pre>

 <table>
 <tr>
 <th>Return value</th>
 <th>Conditions</th>
 </tr>
 <tr>
 <td><code>FLASH_LOCK_UNKNOWN</code>
 </td>
 <td><p>Returned only by devices upgrading to Android 7.0 that have not supported
 bootloader changes required to get the flash lock status if they support
 flashing lock/unlock capability.</p>
 <p>New Android 7.0 devices must be in either <code>FLASH_LOCK_LOCKED</code> or
 <code>FLASH_LOCK_UNLOCKED</code> state. If a device is upgrading to Android 7.0
 and does not support flashing unlock/lock capability, it should simply return
 <code>FLASH_LOCK_LOCKED</code> state.</p>
 </td>
 </tr>
 <tr>
 <td><code>FLASH_LOCK_LOCKED</code>
 </td>
 <td>Should be returned by any device that does not support flashing
 lock/unlock (i.e. the device is always locked), or any device that does support
 flashing lock/unlock and is in the locked state.
 </td>
 </tr>
 <tr>
 <td><code>FLASH_LOCK_UNLOCKED</code>
 </td>
 <td>Returned by any device that supports flashing lock/unlock and is
 currently in the unlocked state.
 </td>
 </tr>
 </table>

 <h3 id="examples-and-source">Examples and source</h3>

 <p>AOSP contains a reference implementation that returns a value based on the
 <code>ro.boot.flash.locked</code> boot property. The code lives in the following
 directories:</p>

 <pre>
 frameworks/base/services/core/java/com/android/server/PersistentDataBlockService.java
 frameworks/base/core/java/android/service/persistentdata/PersistentDataBlockManager.java
 </pre>

 <h3 id="validation">Validation</h3>
 <p>Manufacturers should test the values returned by devices with locked and
 unlocked bootloaders.</p>

 <h2 id="selecting-device-build">Selecting a device build</h2>

 <p>The recommended builds for devices are available from the lunch menu,
 accessed when running the <code>lunch</code> command with no arguments. You can
 download factory images and binaries for Nexus devices from
 developers.google.com:</p>

 <ul>
 <li><a href="https://developers.google.com/android/nexus/blobs-preview">Preview
 binaries (blobs)</a></li>
 <li><a href="https://developers.google.com/android/nexus/images">Factory images
 for released devices</a></li>
 <li><a href="https://developers.google.com/android/nexus/drivers">Support
 binaries (drivers) for release devices</a></li>
 </ul>

 <p>For details and additional resources, see
 <a href="building.html#obtaining-proprietary-binaries">Obtaining proprietary
 binaries</a> and <a href="requirements.html#binaries">Device binaries
 requirements</a>.</p>

 <table>
 <thead>
 <tr>
 <th>Device</th>
 <th>Code name</th>
 <th>Build configuration</th>
 </tr>
 </thead>
 <tbody>
 <tr>
 <td>Pixel XL</td>
 <td>marlin</td>
 <td>aosp_marlin-userdebug</td>
 </tr>
 <tr>
 <td>Pixel</td>
 <td>sailfish</td>
 <td>aosp_sailfish-userdebug</td>
 </tr>
 <tr>
 <td>HiKey</td>
 <td>hikey</td>
 <td>hikey-userdebug</td>
 </tr>
 <tr>
 <td>Nexus 6P</td>
 <td>angler</td>
 <td>aosp_angler-userdebug</td>
 </tr>
 <tr>
 <td>Nexus 5X</td>
 <td>bullhead</td>
 <td>aosp_bullhead-userdebug</td>
 </tr>
 <tr>
 <td>Nexus 6</td>
 <td>shamu</td>
 <td>aosp_shamu-userdebug</td>
 </tr>
 <tr>
 <td>Nexus Player</td>
 <td>fugu</td>
 <td>aosp_fugu-userdebug</td>
 </tr>
 <tr>
 <td>Nexus 9</td>
 <td>volantis (flounder)</td>
 <td>aosp_flounder-userdebug</td>
 </tr>
 <tr>
 <td>Nexus 5 (GSM/LTE)</td>
 <td>hammerhead</td>
 <td>aosp_hammerhead-userdebug</td>
 </tr>
 <tr>
 <td>Nexus 7 (Wi-Fi)</td>
 <td>razor (flo)</td>
 <td>aosp_flo-userdebug</td>
 </tr>
 <tr>
 <td>Nexus 7 (Mobile)</td>
 <td>razorg (deb)</td>
 <td>aosp_deb-userdebug</td>
 </tr>
 <tr>
 <td>Nexus 10</td>
 <td>mantaray (manta)</td>
 <td>full_manta-userdebug</td>
 </tr>
 <tr>
 <td>Nexus 4</td>
 <td>occam (mako)</td>
 <td>full_mako-userdebug</td>
 </tr>
 <tr>
 <td>Nexus 7 (Wi-Fi)</td>
 <td>nakasi (grouper)</td>
 <td>full_grouper-userdebug</td>
 </tr>
 <tr>
 <td>Nexus 7 (Mobile)</td>
 <td>nakasig (tilapia)</td>
 <td>full_tilapia-userdebug</td>
 </tr>
 <tr>
 <td>Galaxy Nexus (GSM/HSPA+)</td>
 <td>yakju (maguro)</td>
 <td>full_maguro-userdebug</td>
 </tr>
 <tr>
 <td>Galaxy Nexus (Verizon)</td>
 <td>mysid (toro)</td>
 <td>aosp_toro-userdebug</td>
 </tr>
 <tr>
 <td>Galaxy Nexus (Experimental)</td>
 <td>mysidspr (toroplus)</td>
 <td>aosp_toroplus-userdebug</td>
 </tr>
 <tr>
 <td>Motorola Xoom (U.S. Wi-Fi)</td>
 <td>wingray</td>
 <td>full_wingray-userdebug</td>
 </tr>
 <tr>
 <td>Nexus S</td>
 <td>soju (crespo)</td>
 <td>full_crespo-userdebug</td>
 </tr>
 <tr>
 <td>Nexus S 4G</td>
 <td>sojus (crespo4g)</td>
 <td>full_crespo4g-userdebug</td>
 </tr>
 </tbody>
 </table>

 <p class="note"><b>Note</b>: Do not use Android 4.1.1 on a Nexus 7 originally
 sold with Android 4.1.2 or newer.</p>

 <h2 id="flashing-a-device">Flashing a device</h2>

 <p>You can flash an entire Android system in a single command; doing so verifies
 the system being flashed is compatible with the installed bootloader and radio,
 writes the boot, recovery, and system partitions together, then reboots the
 system. Flashing also erases all user data, similarly to <code>fastboot oem
 unlock</code>.</p>

 <p>Place the device in fastboot mode either manually by holding the appropriate
 key combination at boot, or from the shell with:</p>

 <pre class="devsite-terminal devsite-click-to-copy">
 adb reboot bootloader
 </pre>

 <p>After the device is in fastboot mode, run:</p>

 <pre class="devsite-terminal devsite-click-to-copy">
 fastboot flashall -w
 </pre>

 <p>The <code>-w</code> option wipes the <code>/data</code> partition on the
 device; this is useful for your first time flashing a particular device but is
 otherwise unnecessary.</p>

 <p class="note"><strong>Note</strong>: Filesystems created via fastboot on
 Motorola Xoom do not function optimally. We recommend re-creating filesystems
 through recovery, using: <code>$ adb reboot recovery</code>. While in recovery,
 open the menu (press Power + Volume Up), wipe the cache partition, then wipe
 data.</p>


 <h2 id="restoring-devices-to-factory-state">Restoring devices to factory
 state</h2>

 <p>Factory images for Nexus 5, Nexus 10, Nexus 4, Nexus Q, Nexus 7, Galaxy Nexus
 (GSM/HSPA+ "yakju" and "takju", and CDMA/LTE "mysid" and "mysidspr"), Nexus S,
 and Nexus S 4G are available from
 <a href="https://developers.google.com/android/nexus/images">Google's factory
 image</a> page.</p>

 <p>Factory images for the Motorola Xoom are distributed directly by Motorola.</p>

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	<meta name="project_path" value="/_project.yaml" />
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	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License.
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	<p>This page provides details for running builds on specific devices and is
	designed to complement the information in
	<a href="/source/building.html">Building the System</a>.</p>

	<h2 id="building-fastboot-and-adb">Building fastboot and adb</h2>
	<p>If you don't already have fastboot and adb, you can build them with the
	regular build system. Use the instructions in
	<a href="/source/building.html">Building a System</a> and replace the
	main <code>make</code> command with:</p>
	<pre class="devsite-terminal devsite-click-to-copy">
	make fastboot adb
	</pre>

	<h2 id="booting-into-fastboot-mode">Booting into fastboot mode</h2>
	<p><em>Fastboot</em> is a bootloader mode in which you can flash a device.
	During a cold boot of a device, use the following key combinations to boot into
	fastboot mode:</p>
	<table>
	<thead>
	<tr>
	<th>Codename</th>
	<th>Device</th>
	<th>Keys</th>
	</tr>
	</thead>
	<tbody>
	<tr>
	<td>marlin</td><td>Pixel XL</td>
	<td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>sailfish</td>
	<td>Pixel</td>
	<td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>hikey</td>
	<td>hikey</td>
	<td>Link pins 1 - 2 and 5 - 6 of J15</td>
	</tr>
	<tr>
	<td>angler</td>
	<td>Nexus 6P</td>
	<td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>bullhead</td>
	<td>Nexus 5X</td>
	<td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>shamu</td>
	<td>Nexus 6</td>
	<td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>fugu</td>
	<td>Nexus Player</td>
	<td>Press and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>volantis</td>
	<td>Nexus 9</td>
	<td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>hammerhead</td>
	<td>Nexus 5</td>
	<td>Press and hold both <em>Volume Up</em> and <em>Volume Down</em>, then press
	and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>flo</td>
	<td>Nexus 7</td>
	<td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>deb</td>
	<td>Nexus 7 3G</td>
	<td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>manta</td>
	<td>Nexus 10</td>
	<td>Press and hold both <em>Volume Up</em> and <em>Volume Down</em>, then press
	and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>mako</td>
	<td>Nexus 4</td>
	<td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>grouper</td>
	<td>Nexus 7 (2012)</td>
	<td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>tilapia</td>
	<td>Nexus 7 3G (2012)</td>
	<td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>phantasm</td>
	<td>Nexus Q</td>
	<td>Power the device, cover it with one hand after the LEDs light up and until
	they turn red</td>
	</tr>
	<tr>
	<td>maguro</td>
	<td>Galaxy Nexus GSM</td>
	<td>Press and hold both <em>Volume Up</em> and <em>Volume Down</em>, then press
	and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>toro</td>
	<td>Galaxy Nexus (Verizon)</td>
	<td>Press and hold both <em>Volume Up</em> and <em>Volume Down</em>, then press
	and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>toroplus</td>
	<td>Galaxy Nexus (Sprint)</td>
	<td>Press and hold both <em>Volume Up</em> and <em>Volume Down</em>, then press
	and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>wingray</td>
	<td>Motorola Xoom</td>
	<td>Press and hold <em>Volume Down</em>, then press and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>crespo</td>
	<td>Nexus S</td>
	<td>Press and hold <em>Volume Up</em>, then press and hold <em>Power</em></td>
	</tr>
	<tr>
	<td>crespo4g</td>
	<td>Nexus SG</td>
	<td>Press and hold <em>Volume Up</em>, then press and hold <em>Power</em></td>
	</tr>
	</tbody>
	</table>
	<p>You can also use the command <code>adb reboot bootloader</code> to reboot
	from Android directly into the bootloader with no key combinations.</p>

	<h2 id="unlocking-the-bootloader">Unlocking the bootloader</h2>

	<p>You can flash a custom system only if the bootloader allows it, and the
	bootloader is locked by default. You can unlock the bootloader, but doing so
	deletes user data for privacy reasons. After unlocking, <em>all</em> data on the
	device is erased, i.e. both application private data and shared data accessible
	over USB (including photos and movies). Before attempting to unlock the
	bootloader, be sure to back up any important files on the device.</p>

	<p>You need to unlock the bootloader only once, and you can re-lock it if
	necessary.</p>

	<h3>Unlocking recent devices</h3>
	<p>All Nexus and Pixel devices released since 2014 (starting with Nexus 6 and
	Nexus 9) have factory reset protection and require a multi-step process to
	unlock the bootloader.</p>

	<ol>
	<li>Enable OEM unlocking on the device:
	<ol style="list-style-type:lower-alpha">
	<li>In Settings, tap <strong>About phone</strong>, then tap <strong>Build number</strong> seven (7) times.</li>
	<li>When you see the message "You are a developer", tap the back button.</li>
	<li>Tap <strong>Developer options</strong> and enable <strong>OEM unlocking</strong> and <strong>USB debugging</strong>. (If OEM unlocking is disabled, connect to the Internet so the device can check in at least once. If it remains disabled, your device may be SIM locked by your carrier and the bootloader cannot be unlocked.)</li>
	</ol>
	</li>
	<li>Reboot into the bootloader and use fastboot to unlock it.
	<ul>
	<li>For new devices (2015 and later):
	<pre class="devsite-terminal devsite-click-to-copy">
	fastboot flashing unlock
	</pre>
	</li>
	<li>For older devices (2014 and earlier):
	<pre class="devsite-terminal devsite-click-to-copy">
	fastboot oem unlock
	</pre>
	</li>
	</ul>
	You must confirm the unlock onscreen.
	</li>
	</ol>

	<p class="note"><strong>Note:</strong> On Nexus 10, after unlocking the
	bootloader, the internal storage remains unformatted. You can format the device
	using <code>fastboot format cache</code> followed by <code>fastboot format userdata</code></p>

	<h3 id="relocking-the-bootloader">Re-locking the bootloader</h3>
	<p>To re-lock the bootloader:</p>
	<ul>
	<li>For new devices (2015 and later):
	<pre class="devsite-terminal devsite-click-to-copy">
	fastboot flashing lock
	</pre>
	</li>
	<li>For older devices (2014 and earlier):
	<pre class="devsite-terminal devsite-click-to-copy">
	fastboot oem lock
	</pre>
	</li>
	</ul>

	<p class="note"><strong>Note</strong>: Re-locking the bootloading on a Motorola
	Xoom erases user data (including the shared USB data).</p>

	<h2 id="flash-unlock">Using Flash Unlock</h2>

	<p>Android 7.0 includes a new system API, <code>getFlashLockState()</code>, to
	transmit bootloader state, as well as the following system API that returns the
	bootloader’s lock status on compliant devices:</p>

	<pre>
	PersistentDataBlockManager.getFlashLockState()
	</pre>

	<table>
	<tr>
	<th>Return value</th>
	<th>Conditions</th>
	</tr>
	<tr>
	<td><code>FLASH_LOCK_UNKNOWN</code>
	</td>
	<td><p>Returned only by devices upgrading to Android 7.0 that have not supported
	bootloader changes required to get the flash lock status if they support
	flashing lock/unlock capability.</p>
	<p>New Android 7.0 devices must be in either <code>FLASH_LOCK_LOCKED</code> or
	<code>FLASH_LOCK_UNLOCKED</code> state. If a device is upgrading to Android 7.0
	and does not support flashing unlock/lock capability, it should simply return
	<code>FLASH_LOCK_LOCKED</code> state.</p>
	</td>
	</tr>
	<tr>
	<td><code>FLASH_LOCK_LOCKED</code>
	</td>
	<td>Should be returned by any device that does not support flashing
	lock/unlock (i.e. the device is always locked), or any device that does support
	flashing lock/unlock and is in the locked state.
	</td>
	</tr>
	<tr>
	<td><code>FLASH_LOCK_UNLOCKED</code>
	</td>
	<td>Returned by any device that supports flashing lock/unlock and is
	currently in the unlocked state.
	</td>
	</tr>
	</table>

	<h3 id="examples-and-source">Examples and source</h3>

	<p>AOSP contains a reference implementation that returns a value based on the
	<code>ro.boot.flash.locked</code> boot property. The code lives in the following
	directories:</p>

	<pre>
	frameworks/base/services/core/java/com/android/server/PersistentDataBlockService.java
	frameworks/base/core/java/android/service/persistentdata/PersistentDataBlockManager.java
	</pre>

	<h3 id="validation">Validation</h3>
	<p>Manufacturers should test the values returned by devices with locked and
	unlocked bootloaders.</p>

	<h2 id="selecting-device-build">Selecting a device build</h2>

	<p>The recommended builds for devices are available from the lunch menu,
	accessed when running the <code>lunch</code> command with no arguments. You can
	download factory images and binaries for Nexus devices from
	developers.google.com:</p>

	<ul>
	<li><a href="https://developers.google.com/android/nexus/blobs-preview">Preview
	binaries (blobs)</a></li>
	<li><a href="https://developers.google.com/android/nexus/images">Factory images
	for released devices</a></li>
	<li><a href="https://developers.google.com/android/nexus/drivers">Support
	binaries (drivers) for release devices</a></li>
	</ul>

	<p>For details and additional resources, see
	<a href="building.html#obtaining-proprietary-binaries">Obtaining proprietary
	binaries</a> and <a href="requirements.html#binaries">Device binaries
	requirements</a>.</p>

	<table>
	<thead>
	<tr>
	<th>Device</th>
	<th>Code name</th>
	<th>Build configuration</th>
	</tr>
	</thead>
	<tbody>
	<tr>
	<td>Pixel XL</td>
	<td>marlin</td>
	<td>aosp_marlin-userdebug</td>
	</tr>
	<tr>
	<td>Pixel</td>
	<td>sailfish</td>
	<td>aosp_sailfish-userdebug</td>
	</tr>
	<tr>
	<td>HiKey</td>
	<td>hikey</td>
	<td>hikey-userdebug</td>
	</tr>
	<tr>
	<td>Nexus 6P</td>
	<td>angler</td>
	<td>aosp_angler-userdebug</td>
	</tr>
	<tr>
	<td>Nexus 5X</td>
	<td>bullhead</td>
	<td>aosp_bullhead-userdebug</td>
	</tr>
	<tr>
	<td>Nexus 6</td>
	<td>shamu</td>
	<td>aosp_shamu-userdebug</td>
	</tr>
	<tr>
	<td>Nexus Player</td>
	<td>fugu</td>
	<td>aosp_fugu-userdebug</td>
	</tr>
	<tr>
	<td>Nexus 9</td>
	<td>volantis (flounder)</td>
	<td>aosp_flounder-userdebug</td>
	</tr>
	<tr>
	<td>Nexus 5 (GSM/LTE)</td>
	<td>hammerhead</td>
	<td>aosp_hammerhead-userdebug</td>
	</tr>
	<tr>
	<td>Nexus 7 (Wi-Fi)</td>
	<td>razor (flo)</td>
	<td>aosp_flo-userdebug</td>
	</tr>
	<tr>
	<td>Nexus 7 (Mobile)</td>
	<td>razorg (deb)</td>
	<td>aosp_deb-userdebug</td>
	</tr>
	<tr>
	<td>Nexus 10</td>
	<td>mantaray (manta)</td>
	<td>full_manta-userdebug</td>
	</tr>
	<tr>
	<td>Nexus 4</td>
	<td>occam (mako)</td>
	<td>full_mako-userdebug</td>
	</tr>
	<tr>
	<td>Nexus 7 (Wi-Fi)</td>
	<td>nakasi (grouper)</td>
	<td>full_grouper-userdebug</td>
	</tr>
	<tr>
	<td>Nexus 7 (Mobile)</td>
	<td>nakasig (tilapia)</td>
	<td>full_tilapia-userdebug</td>
	</tr>
	<tr>
	<td>Galaxy Nexus (GSM/HSPA+)</td>
	<td>yakju (maguro)</td>
	<td>full_maguro-userdebug</td>
	</tr>
	<tr>
	<td>Galaxy Nexus (Verizon)</td>
	<td>mysid (toro)</td>
	<td>aosp_toro-userdebug</td>
	</tr>
	<tr>
	<td>Galaxy Nexus (Experimental)</td>
	<td>mysidspr (toroplus)</td>
	<td>aosp_toroplus-userdebug</td>
	</tr>
	<tr>
	<td>Motorola Xoom (U.S. Wi-Fi)</td>
	<td>wingray</td>
	<td>full_wingray-userdebug</td>
	</tr>
	<tr>
	<td>Nexus S</td>
	<td>soju (crespo)</td>
	<td>full_crespo-userdebug</td>
	</tr>
	<tr>
	<td>Nexus S 4G</td>
	<td>sojus (crespo4g)</td>
	<td>full_crespo4g-userdebug</td>
	</tr>
	</tbody>
	</table>

	<p class="note"><b>Note</b>: Do not use Android 4.1.1 on a Nexus 7 originally
	sold with Android 4.1.2 or newer.</p>

	<h2 id="flashing-a-device">Flashing a device</h2>

	<p>You can flash an entire Android system in a single command; doing so verifies
	the system being flashed is compatible with the installed bootloader and radio,
	writes the boot, recovery, and system partitions together, then reboots the
	system. Flashing also erases all user data, similarly to <code>fastboot oem
	unlock</code>.</p>

	<p>Place the device in fastboot mode either manually by holding the appropriate
	key combination at boot, or from the shell with:</p>

	<pre class="devsite-terminal devsite-click-to-copy">
	adb reboot bootloader
	</pre>

	<p>After the device is in fastboot mode, run:</p>

	<pre class="devsite-terminal devsite-click-to-copy">
	fastboot flashall -w
	</pre>

	<p>The <code>-w</code> option wipes the <code>/data</code> partition on the
	device; this is useful for your first time flashing a particular device but is
	otherwise unnecessary.</p>

	<p class="note"><strong>Note</strong>: Filesystems created via fastboot on
	Motorola Xoom do not function optimally. We recommend re-creating filesystems
	through recovery, using: <code>$ adb reboot recovery</code>. While in recovery,
	open the menu (press Power + Volume Up), wipe the cache partition, then wipe
	data.</p>


	<h2 id="restoring-devices-to-factory-state">Restoring devices to factory
	state</h2>

	<p>Factory images for Nexus 5, Nexus 10, Nexus 4, Nexus Q, Nexus 7, Galaxy Nexus
	(GSM/HSPA+ "yakju" and "takju", and CDMA/LTE "mysid" and "mysidspr"), Nexus S,
	and Nexus S 4G are available from
	<a href="https://developers.google.com/android/nexus/images">Google's factory
	image</a> page.</p>

	<p>Factory images for the Motorola Xoom are distributed directly by Motorola.</p>

	</body>
	</html>