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[How To Guide] Upgrading OnePlus 2 To Oxygen OS 3.5.7 And Enable VoLTE Supporting Reliance Jio

Voice over Long-Term Evolution (VoLTE) is a standard for offering high-quality HD-voice communication wirelessly over 4G LTE network, being a new technology even 4G capable mobile devices need addtional hardware and/or software support to be VoLTE compatible. Today we will see how to flash and upgrade the latest Oxygen OS 3.5.7 ROM on OnePlus2 device to enable the VoLTE capability for Reliance Jio network in India.

If your device is not rooted and no modification to system files is being done, you can simply update using the OTA provided by the device manufacture or flash the latest Oxygen OS 3.5.7 from Stock/TWRP recovery using OTA file
[Size : 8.3 MB]
from here -
For rooted devices we will need to use "Signed flashable zip" which will not overwrite the data partition, but Full-ROM needs to be flashed via stock or TWRP recovery as demonstrated below .
  1. Download the full-signed ROM of Oxygen OS 3.5.7 sizing 1.2 GB from here - and save it in "Download" folder.
    File Downloaded
  2. Now, Reboot into "Recovery" mode, either from the Advanced Boot Menu (can be enabled from developer options) as shown below or using the "Power + Volume Up" key combo from a powered down phone.
    Reboot into Recovery Mode
  3. Once into Stock/TWRP recovery mode, Tap the "Install" button, select the zip downloaded in Step 1 above and Tap "Install Image" button.
    Installing Signed ROM from TWRP
  4. Swipe and Confirm the flashing of ROM.
    Confirm Android ROM Flash For OnePlus2
  5. Let the process finish.
    OnePlus2 VoLTE ROM Flashing

    OnePlus2 VoLTE ROM Flashing

  6. Once "done", tap the "Wipe cache/dalvik" button to clear caches.
    Wipe cache/dalvik

    Confirm Wipe cache/dalvik

  7. "Reboot" the system.
    Reboot OnePlus2

    Disable Stock Recovery

  8. Once fully booted you can see VoLTE enabled and fully functional with Reliance Jio 4G SIM.
    Disable Stock Recovery

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