Sony Xperia Z5 Compact is still a premium smartphone with high-end performance and which is now available on an appealing price. And above all, the phone can smoothly run on the latest Android 8.0 Oreo firmware, which will be coming as an official OTA during the following weeks. However, if you’re already using the Z5 and if you want to test the Oreo software ahead of the official Sony roll out, I have something that might interest you: the unofficial build of Lineage OS 15 that can now be successfully booted and enjoyed on your own Sony Xperia Z5 Compact.

Thus, during these guidelines we will discuss more about this new update opportunity that’s available for your Xperia Z5 Compact. Shortly, we will review the advantages and the risks implied by this process, we will check out the essential pre requisites and finally we will detail the actual steps that must be followed.

The Lineage OS 15 platform comes with the CyanogenMod functionality along with other extra features, apps and capabilities. This custom ROM is based on Android 8.0 Oreo but it’s still under development stage – it means that from time to time, rarely though, you might experience some minor issues such as bugs or hangs. However, the LineageOS software should smoothly run on your Sony Xperia Z5 Compact on a daily basis regardless of what you choose to install or run on your smartphone.

The best is that Lineage OS can be easily tweaked so that you can afterwards improve the general performance of your Sony Xperia Z5 Compact– you can bump speed, upgrade the battery life, overclock or undervolt CPU frequencies and so much more. Overall, your device should run better and faster once this Android 8.0 Oreo powered ROM is installed.

A custom ROM is an unofficial built of Android OS. In fact, it is only a free aftermarket distribution of Android, developed and offered by third party devs. Therefore, the LineageOS 15 firmware cannot be associated with Sony or with Google. Moreover, by flashing this particular update you are going to lose your phone’s warranty – that’s the main risk that’s related with this step by step guide.

Another risk is related with your personal data, info, accounts and files – basically with everything that wasn’t there when you first bought your handset. You see, during the Lineage OS 15 update procedure a wipe will be initiated – you will have to complete a hard reset and to clear app data cache. Thus, you can lose your images, videos, audio files, market apps, internet settings, calendar info, contacts, call logs, texts and so on. Therefore, a backup is more than recommended – you need to sync your files with your Google Account, to use built-in cloud storage platform, to download and use backup and restore apps from Google Play or to use any other similar backup solution.

Additionally, for avoiding any possible unpleasant situations you need to make a Nandroid backup. This is a dedicated operation through which you can save the current Android OS that runs on your Sony Xperia Z5 Compact. Shortly, if the new Android 8.0 Oreo Lineage OS 15 will not run as you expected, you can choose to flash the Nandroid backup package in order to go back to stock.

You can successfully perform the steps explained below only if you first take care of the following essential pre-requisites:

  • Unlock the bootloader of your Sony branded device.
  • And unlocked bootloader is required for the root operation which should be applied next – the root process will unlock the internal system which will afterwards be modified and customized by the new LineageOS platform.
  • Moreover, a custom recovery image must be installed on your Xperia Z5 Compact – through this environment you will complete the actual update operation. Hint: I recommend you to use the latest version of TWRP recovery for making things work from your first attempt.
  • This is a manual update procedure so a computer is required; your phone and its USB cable will be also needed.
  • On your smartphone you need to gain Developer rights – you can do that by going to About Phone from where you need to tap repeatedly on Built Number: keep tapping on this field until you receive the ‘you are a developer’ message.
  • Afterwards, from Developer Options, it should be located within Menu - > Settings, you have to check the USB Debugging field.
  • Charge your Xperia Z5 before resuming the update operation. It’s important to complete this task as otherwise your handset can get turned off in the middle of the update procedure and in that situation soft related problems might be caused on your Android device.
  • Thus, plug in the charger if the power is currently lower than 50%.
  • Finally, make sure you resume the process explained below only if you own the Sony Xperia Z5 Compact; the Lineage OS 15 custom ROM package from below is compatible only with this particular Android powered handset.

How to Update Sony Xperia Z5 Compact to Android 8.0 Oreo via Lineage OS 15 custom ROM firmware

  1. Download the LineageOS 15 custom ROM package for your Sony Xperia Z5 Compact (UPDATE: it seems that for now the devs pulled down the download links for the Oreo powered firmware; however you can still install the Lineage OS 14.1 build– you can get this file from here).
  2. Optional, but recommended: download compatible Google Apps because this package it’s not included in the update package so it must be flashed separately.
  3. Place both files on desktop.
  4. Meanwhile, switch off your handset - press and hold the Power key for a few moments until the power off process is completed or press the Power button once and select ‘power off’.
  5. Next, reboot recovery mode on your Sony Xperia Z5 Compact.
  6. In recovery choose to wipe everything by selecting ‘wipe data factory reset’ followed by ‘wipe cache partition’ and by ‘wipe dalvik cache’.
  7. Then, go to main menu of recovery and tap on Reboot.
  8. Connect your handset with your computer with the help of your phone’s USB cable.
  9. Select the downloaded files from desktop and transfer them on your phone. Then, remove the USB cable as the computer is no longer useful.
  10. Now, go to recovery mode once again.
  11. From there, tap on Install. Load the Lineage OS 15 custom ROM package and resume the flashing operation.
  12. Then, return the last step and install the Google Apps package on your Sony Xperia Z5 Compact.
  13. In the end, return to main menu of recovery and choose Reboot.
  14. That should be all.

Good work; the Lineage OS 15 ROM will now boot on your Sony Xperia Z5 Compact so you can now test the Android 8.0 Oreo software right on your smartphone. You can share your observations with us and with other users who are ready to use this update opportunity by filling out the comments field from down below. Enjoy and stay close for further tutorials and other similar Android related tips and tricks.

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