Write up on LineageOS for Pixel 3a and fixes
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---
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title: "Installing LineageOS Unofficial on Pixel 3a"
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date: 2020-07-13
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lastmod: 2020-07-13
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draft: false
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tags: ["android", "security", "hacking"]
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categories: ["Tutorial"]
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contentCopyright: true
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hideHeaderAndFooter: false
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preview: "/static/img/lineageos-pixel3a/lineage-settings.png"
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---
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In this post I aim to highlight my findings in deciding to go through the
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process of installing LineageOS on my Pixel 3a. Currently, LineageOS does not
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officially support the Pixel 3a. However, InvisibleK (Dan Pasanen) does host
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updated versions of his unofficial LineageOS build for the Pixel 3a complete
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with a custom recovery to utilize for this purpose!
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{{< thumbgallery >}}
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{{< thumb src="/static/img/lineageos-pixel3a/lineage-settings.png"
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alt="Screenshot showing the LineageOS version and other LineageOS settings on the Pixel 3a" >}}
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{{< thumb src="/static/img/lineageos-pixel3a/lineage-trust.png"
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alt="Screenshot showing the LineageOS Trust feature" >}}
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{{< /thumbgallery >}}
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<!--more-->
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# Thank You
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Before going on any further, I'd like to take a moment to give my sincere thanks
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to InvisibleK (Dan Pasanen). Having to set up the entire custom build for Pixel
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3a of LineageOS myself would add far more overhead in the overall simple task in
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trying to get LineageOS to work on a Pixel 3a!
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# Preface
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There are plenty of guides out there on how to install and set up ADB and
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Fastboot on your host machine. For me, on Arch Linux, this was as simple as
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running `pacman -S android-tools`. However, should you be on MacOS or Windows
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you may have to find resources on how to go about this. I do not intend to go
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over this here -- __sorry_.
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Additionally, this _guide_ also assumes the reader has some familiarity with ADB
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and/or Fastboot.
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# Source Files
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If you, the reader, knows what you're doing and simply just require the files
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for your Pixel 3a they can be found here:
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- https://updater.invisiblek.org/sargo
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# Installation
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{{< admonition warning "Warning!" >}}
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If it isn't abundantly clear by now, be aware that you **will be destroying all
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the data currently on your Pixel 3a** in the process of installing LineageOS on
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your device! Stop now and back up any files, 2FA codes, or other prior to
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proceeding.
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{{< /admonition >}}
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## Note about TWRP
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As of writing this, TWRP[^1] (_a custom recovery commonly used in custom OS
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installation_) does not support Pixel 3a. However, if it does
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## Flash to Stock
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Google is kind enough to provide a plethora of versions of the stock images for
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the Pixel devices. In my process of installing LineageOS, as it will be on
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Android 10, I made sure to flash to the latest stock version of Pixel 3a Android
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10. Do note that the versions are listed in reverse order, with the latest being
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found in the bottom-most row.
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- https://developers.google.com/android/images
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Additionally, Google provides a helper script `flash-all` that I highly
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recommend running as-is to flash your Pixel 3a to stock. This will take some
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## Flash Custom Recovery
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Using InvisibleK's build page, you'll find the required custom recovery image
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for flashing found at the bottom of the list of zip files marked with a lone
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"download" link.
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Download, then flash it via the following:
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1. Reboot to recovery
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```bash
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$ adb reboot bootloader
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```
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1. Flash the custom recovery (_make sure to replace `N` with the version you
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downloaded, mine was '4'_)
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```bash
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$ fastboot flash boot sargo-recovery-eng-N.img
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```
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1. Boot the custom recovery either by re-entering recovery mode or fastboot --
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make sure to wait for it to enter Android Recovery after
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```bash
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$ fastboot boot sargo-recovery-eng-N.img
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```
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## Install LineageOS
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Now that the custom recovery is set up and booted into, we're ready to install LineageOS!
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1. **Important!** Once in recovery, ensure to 'Wipe data/factory reset' prior to
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proceeding.
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1. Select 'Apply update from ADB'
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1. ADB Sideload the version, if not latest, of LineageOS you want for your Pixel
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3a
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```bash
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$ adb sideload lineage-17.1-2020517-UNOFFICIAL-sargo.zip
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```
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1. Wait for installation to complete then select 'Reboot system now' from the
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recovery menu
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1. Enjoy LineageOS!
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## Verification
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Once in LineageOS, you can browse the settings to verify the installation and
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set up Trust the preferred way. Personally, I chose to leave the defaults.
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[^1]: [Team Win Recovery Project](https://twrp.me/)
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