In this detailed guide, we will let you know that how to update OnePlus 3/3T to Android 8.0 Oreo via new build of Lineage OS 15 custom firmware. As we know, the Android 8.0 Oreo official update is still far away, so until that we recommend you to upgrade your devices to Android 8.0 Oreo. Thanks to the XDA Developers to build this amazing custom firmware for OnePlus 3/3T. This latest custom firmware brings a lot of new features from official Android Oreo and also brings some aftermarket features and customizations through which you can modify your device. After flashing this Lineage OS 15 ROM, your device will run faster and smooth without causing bugs, lags or any other problems because your device is still a powerful smartphone. This ROM is not officially announced by OnePlus / Google but just a custom ROM. Your device must be rooted and installed with the latest version of a custom recovery like TWRP or CWM because a custom recovery will be needed to install Lineage OS 15 ROM on your OnePlus 3/3T.
By following this step by step guide, you can easily update your OnePlus 3/3T to Lineage OS 15 Android 8.0 Oreo custom ROM. This latest custom firmware is packed with all the latest features, applications, capabilities and the battery life should be also improved. The Lineage OS 15 ROM is still under development which means you may face some minor issue, but don’t worry about it they will be fixed with time to time. Before proceeding, don’t forget to take a full backup of all your valuable data. If you are interested in installing Lineage OS 15 Android 8.0 Oreo custom ROM on your own OnePlus 3/3T then go ahead and follow the given steps.
This guide containing the Lineage OS 15 Custom ROM is working with the OnePlus 3/3T devices. Do not try to install this ROM on any other device, as a result, your device might get bricked.
AndroidXDA.net will not be held responsible for any damage occurred to your OnePlus 3/3T during or after the installation of Lineage OS 15 ROM. Proceed at your risk.
Before Getting Started:
- Make sure that the battery level of your OnePlus 3/3T is at least about 80% before moving to the installation guide.
- Download and install proper USB Drivers
- It is highly recommended to take a good backup of your important data and settings on the phone using a custom recovery such as CWM or TWRP. In case anything goes wrong then you’ll be able to restore your data.
- Enable USB Debugging Mode on One Plus One from Settings > Developer Options.
- Your phone should be rooted with the latest version of CWM or TWRP recovery installed.
- The bootloader of your phone should be unlocked.
Steps to Update OnePlus 3/3T to Lineage OS 15 ROM:
Here we have given a step-by-step guide on how to install Android 7.1.1 Nougat based Lineage OS 15 custom ROM on OnePlus 3/3T.
Step No 1: – First, download the Lineage OS 15 custom ROM and Google Apps package from the above links on the desktop of your PC. Do not extract these files.
Step No 2: – Now, connect your OnePlus 3/3T to the PC using its USB data cable.
Step No 3: – Move the Lineage OS 15 ROM and Google Apps zipped files to the root folder of SD card on your phone.
Step No 4: – Now, disconnect the device from the PC and turn it OFF in order to boot into Recovery Mode.
Step No 5: – Turn ON the OnePlus 3/3T while pressing and holding Volume Up + Home + Power keys at the same time for a while until the device enters into Recovery Mode.
Step No 6: – Go back to the main recovery menu and perform a full data wipe. This includes Dalvik cache, Cache, System, Factory data reset.
Step No 7: – Go back the main Recovery menu and choose install zip from sdcard> choose zip from sdcard.
Step No 8: – Find the ROM file that you’ve already transferred to the root folder of your SD Card in Step No 3. Select the Lineage OS 15 .zip file and proceed the installation process.
Step No 9: – Once the ROM is successfully installed on your OnePlus 3/3T, install Google Apps package by following the same procedure as given above.
Step No 10: – After the installation of Lineage OS 15 custom ROM and Google Apps, select reboot system now to reboot the phone.
It will take about 5 minutes to boots up for the first time after installing ROM on your phone.
That’s All! You have successfully updated OnePlus 3/3T to the latest Lineage OS 15 custom ROM.