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<h1>Install</h1>
<h2>Prerequisites</h2>
<p>You should have at least 2GB of free memory available.</p>
<p>You need the unlocked variant of one of the supported devices, not a locked carrier
specific variant.</p>
<p>You need an updated copy of the <code>fastboot</code> tool and it needs to be
included in your <code>PATH</code> environment variable. You can run <code>fastboot
--version</code> to determine the current version. It should be at least
<code>28.0.0</code>. Don't proceed with the installation process until this is set up
properly in your current shell. A very common mistake is using an outdated copy of
<code>fastboot</code> from a Linux distribution package not receiving regular updates.
Make sure that the <code>fastboot</code> found earliest in your <code>PATH</code> is
the correct one if you have multiple copies on your system. You can run <code>which
fastboot</code> to determine where the tool being used is coming from. Older versions
do not have support for current devices. Very old versions of <code>fastboot</code>
from several years ago are still shipped by Linux distributions like Debian and lack
the compatibility detection of modern versions so they can soft brick devices.</p>
<h2>Enabling OEM unlocking</h2>
<p>OEM unlocking needs to be enabled from within the operating system.</p>
<p>Enable the developer settings menu by going to Settings ➔ System ➔ About phone and
pressing on the build number menu entry until developer mode is enabled.</p>
<p>Next, go to Settings ➔ System ➔ Advanced ➔ Developer settings and toggle on the
'Enable OEM unlocking' setting. This requires internet access on devices with Google
Play Services.</p>
<h2>Unlocking the bootloader</h2>
<p>First, boot into the bootloader interface. You can do this by turning off the
device and then turning it on by holding both the Volume Down and Power buttons.</p>
<p>The bootloader now needs to be unlocked to allow flashing new images:</p>
<pre>fastboot flashing unlock</pre>
<p>The command needs to be confirmed on the device.</p>
<h2>Obtaining factory images</h2>
<p>The initial install will be performed by flashing the factory images. This will
replace the existing OS installation and wipe all the existing data.</p>
<p>You can download the factory images from <a href="/releases">the releases page</a>.</p>
<p>Verify the official factory images using the GPG signature:</p>
<pre>gpg --recv-keys 65EEFE022108E2B708CBFCF7F9E712E59AF5F22A
gpg --verify blueline-factory-2019.04.01.19.zip.sig blueline-factory-2019.04.01.19.zip</pre>
<p>When this signing key is replaced, the new key will be signed with it.</p>
<h2>Flashing factory images</h2>
<p>Next, extract the factory images and run the script to flash them. Note that the
<code>fastboot</code> command run by the flashing script requires a fair bit of free
space in a temporary directory, which defaults to <code>/tmp</code>:<p>
<pre>unzip blueline-factory-2019.04.01.19.zip
cd blueline-pq2a.190405.003
./flash-all.sh</pre>
<p>Use a different temporary directory if your <code>/tmp</code> doesn't have enough
space available:</p>
<pre>mkdir tmp
TMPDIR="$PWD/tmp" ./flash-all.sh</pre>
<p>Wait for the flashing process to complete and for the device to boot up using the
new operating system.</p>
<p>You should now proceed to locking the bootloader before using the device as locking
wipes the data again.</p>
<h2>Locking the bootloader</h2>
<p>Locking the bootloader is important as it enables full verified boot. It also
prevents using fastboot to flash, format or erase partitions. Verified boot will
detect modifications to any of the OS partitions (vbmeta, boot/dtbo, product, system,
vendor) and it will prevent reading any modified / corrupted data. If changes are
detected, error correction data is used to attempt to obtain the original data at
which point it's verified again which makes verified boot robust to non-malicious
corruption.</p>
<p>Reboot into the bootloader menu and set it to locked:</p>
<pre>fastboot flashing lock</pre>
<p>The command needs to be confirmed on the device since it needs to perform a factory
reset.</p>
<p>Unlocking the bootloader again will perform a factory reset.</p>
<h2>Disabling OEM unlocking</h2>
<p>OEM unlocking can be disabled again in the developer settings menu within the
operating system after booting it up again.</p>
<h2>Replacing GrapheneOS with the stock OS</h2>
<p>Installation of the stock OS via the stock factory images is the same process
described above. However, before locking, there's an additional step to fully revert
the device to a clean factory state on modern devices with Android Verified Boot 2.0
(AVB) like the Pixel 2, Pixel 2 XL, Pixel 3 and Pixel 3 XL. It isn't necessary for
devices with legacy verified boot like the Pixel and Pixel XL.</p>
<p>The GrapheneOS factory images flash a non-stock Android Verified Boot key which
needs to be erased to fully revert back to a stock device state. After flashing the
stock factory images and before locking the bootloader, you should erase the custom
Android Verified Boot key to untrust it:</p>
<pre>fastboot erase avb_custom_key</pre>
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