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Install OxygenOS 3.5.6 on OnePlus 2 [Stable Android 6.0.1]

The 2nd Flagship of OnePlus OEM got Stable Android 6.0.1 Marshmallow on the first quarter of 2017 with VoLTE Functionality, UI improvement and many more new features. This is the Solid Update from Chinese OEM team for the OnePlus 2 which include all the features of OnePlus 3 including fully VoLTE support specially for Reliance Jio SIM in India (Full  update log given below). This is an Official Update from OnePlus's OxygenOS team, so the version is stable and no need to worry about any kind of bugs. Please real all the instruction carefully before flashing the ROM so that nothing goes wrong. On installing new Official ROM improves the device's performance and UI experiences and it will not makes the company warranty void and they will be liable to provide updates in future.

OnePlus 2

This is a Fresh Clean Flash Guide to install OOS 3.5.6 Android 6.0.1 Marshmallow on OnePlus 2. So, make sure the device is Unlocked and rooted before going ahead with custom ROM installation. OR Check our Unlocking Guide here: How to Unlock OnePlus 2 Bootloader and Install TWRP. After unlocking, make sure to Flash SuperSU to Root the phone.

Disclaimer: Please read the following instructions thoroughly before attempting to flash your phone. absolves itself from any responsibility should something go wrong. Please proceed with caution and at your own risk.

As you know, Marshmallow largely maintained the overall look of Lollipop but baked in some big new features like Doze Mode, the fingerprint API and granular permissions. This ROM include some Brand new inbuilt features like Aggressive Doze, Dark Mode, Color Doing Customization and icon packs support.

What's new:

  • Added VoLTE functionality
  • Added App Lock
  • Added Battery Saving Mode ( Settings > Battery > More )
  • Added Gaming Mode ( Settings > Developer Options )
  • Added Additional Options for the Alert Slider.
  • Redesign of the Volume Adjustment Bar
  • Shelf Optimizations
  • Updated OxygenOS UI
  • Updated Interface and UI of the Clock app
  • Updated Google Security Patch for November
  • Fixed Persistent Network Drops
  • Increased System Stability
  • General Bug Fixes

Make sure your Android device is charged up to 80-85% battery level. Why? Because, if your phone goes off suddenly while installing a custom ROM, flashing an official firmware update or installing mods, etc. — your phone might get bricked or go dead permanently. No one wants that, right?

To Remember :
  • This tutorial is only for installing VoLTE OOS 3.5.6 on OnePlus 2. Please do not try on any other OnePlus variants.
  • Your phone should have a custom recovery installed in order to install this VoLTE Patched ROM on your phone.
  • We will be using TWRP Recovery for this tutorial.
  • This tutorial will wipe out all your data. Make sure you backup all your data in your phone before proceeding.
  • Perform a Dalvik Cache wipe before proceeding from the Recovery Mode.
There are tons of useful articles and how-to guides on for the OnePlus 2, but we think you might be interested in the following posts :

    HOW TO: Install OxygenOS 3.5.6 on OnePlus 2

    Step 1: Download OOS 3.5.6 Build ROM for OnePlus 2 to your computer.

    Step 2: Connect and mount your OnePlus 2 USB memory to your computer using the USB cable.

    Step 3: Now copy/paste the downloaded OOS 3.5.6 file to your phone memory / SD card. Make sure the files are in the phone memory / SD card root (not in any folder).

    Step 4: Then turn OFF your phone and disconnect from the USB cable.

    Step 5: Now to get in the Recovery Mode. Switch ON the phone while pressing and holding Volume Down + Power buttons together.

    Step 6: Once you are in TWRP Recovery, perform a full data wipe by tapping on the ‘Wipe’ button. Then swipe on the “Swipe to Factory Reset” option at the bottom.

    Step 7: Now go back to the main menu and then tap on the ‘Install’ button. From the list, choose the ZIP file that you copied to your phone memory in Step 3.

    Step 8: Confirm installation on the next screen by swiping on the "Swipe to Confirm Flash" option. The installation procedure should start now.

    Step 9: Tap on the “Wipe cache/dalvik” button if you get into any boot loops or other issues.

    Step 10: You can now reboot your phone by selecting the “Reboot System” button.

    Your OnePlus 2 will boot now and it might take about 5 minutes to boot on your first time after flashing a new ROM. So, please wait.

    That’s it! Your OnePlus 2 should now have OOS 3.5.6 Android 6.0.1 Marshmallow Official ROM installed on your phone! Go to Settings > About phone to verify.

    Any problem during installation ? Let me know by commenting below! Also, don't forget to share, ONLY if you found this post helpful to you.