Finally OnePlus started rolling out Android 8.0 Oreo based latest OxygenOS open beta 27 for OnePlus 3 and OxygenOS open beta 18 for OnePlus 3T. This is great to see the Oreo beta update released for OnePlus 3 and OnePlus 3T even before OnePlus 5 gets it.
The Android Oreo update is rolling out via OTA as build OP3_O2_Open_27 for OnePlus 3 and OP3_O2_Open_18 for OnePlus 3T. You can get the Oreo update via OTA but ensure you are already running open beta 26 on oneplus 3 and beta 17 on oneplus 3t.
The update brings multiple new features along goodies on Android Oreo update for OnePlus 3/3T. The update weighs around 1.4GB, head to Settings > About device > System updates. If you think your device is rooted then you need to follow the manual installation process below.
Download Oreo OxygenOS beta 27 for OnePlus 3 and beta 18 for Oneplus 3T
Before you begin:
Your device should be charged minimum 60% to avoid shut down during the process.
Latest USB drivers for OnePlus should be installed on PC. Here
Set up adb and fastboot drivers. Follow this quick guide
Process to install OxygenOS beta 27 on OnePlus 3 and beta 18 on Oneplus 3T
Download the OxygenOS open beta 27/18 for Oneplus 3/3T from the link below and transfer the downloaded zip file in a specific folder.
Now open the same folder press Shift+Right Click on any empty area in the folder then choose ‘Open command window here’.
Issue the following command to reboot your device into recovery mode
adb reboot recovery
Once in recovery mode, select ‘Install from USB’ and then type the following command (from the same folder where you placed the firmware file) to start the adb sideload process.
adb sideload filename.zip
The installation process will start and wait for it to complete. Once the process is completed simply type
That’s it! You have the latest OxygenOS beta update on your device.
Download OxygenOS beta 27 for OnePlus 3 [Full Firmware]
Download OxygenOS beta 18 for OnePlus 3T [Full Firmware]