Enable VoLTE in OP6 after updating to Android 11

  1. B0GD1
    Cupcake Aug 17, 2021

    B0GD1 , Aug 17, 2021 :
    Hi guys,

    I've been using the QPST/PDC method to activate VoLTE/WiFi calling on my OP6 but after upgrading to Android 11 it's game over. PDC doesn't see the phone anymore so it's no longer possible to change profiles. Do you know any other way to enable these features?


  2. robertaramar
    Donut Aug 17, 2021

    robertaramar , Aug 17, 2021 :
    I am suffering from that very same issue, any hints are welcome.

  3. B0GD1
    Cupcake Aug 17, 2021

  4. BaronHell
    Cupcake Aug 17, 2021

    B0GD1 likes this.
  5. y0uri
    Cupcake Aug 19, 2021

    y0uri , Aug 19, 2021 :
    Please do, thank you!

    Thanks, I have tried this, but to no avail. I get the error:

    "Error on upload file '/ims/imshandoverconfig'. EFS error. Code = 26"

    And after reboot there's no VoLTE. Tried a bunch of different mbn files. Tried with both 1.1 and 1.2.

    NB: I had VoLTE/VoWiFi running successfully on Android 10.

  6. B0GD1
    Cupcake Aug 21, 2021

  7. A1556204900930
    Cupcake Aug 21, 2021

  8. B0GD1
    Cupcake Aug 24, 2021

    B0GD1 , Aug 24, 2021 :
    I managed to activate VoLTE using this method. VoWiFi still doesn't work.
    When choosing to apply a different profile (mcfg_sw.mbn) the following errors appear:

    "Error on upload file '/ims/imshandoverconfig'. EFS error. Code = 26"

    Any ideas?

  9. herkulo
    Froyo Sep 23, 2021

    herkulo , Sep 23, 2021 :
    activation VOLTE on android 11. Verified and fully functional.


    Tools to be needed:

    Oneplus Drivers
    Qualcom Drivers
    QSPT Software

    1st - Connect your phone and run adb on administrator mode and type this command:

    adb devices - make sure that your device is working on adb

    adb reboot ftm - this will reboot your phone into diagnostic mode and you can see Chinese characters there

    adb shell

    then type this command

    setprop sys.usb.config diag,serial_cdev,rmnet,adb then enter

    after that, don't close the command prompt

    2nd - open device manager and make sure on the com port tab, you can see the Qualcomm HS something like that.

    if you can see that the driver is installed, next is

    3rd - open PDC as administrator

    4th -Select your device on the drop-down menu then if you see your device select it and right-click on "Oversea-Commercial_DS" and deactivate Sub0 and Sub1
    Click on Oversea-Commercial_DS again and click on remove -- DO NOT CLICK REMOVE, JUST DE-ACTIVATE IT - your settings stick after a reboot, so no longer need to remove the profile (at least on my device my profiles stick, also makes it easier to go back to default)

    5th - Close the app and reopen it

    6th - Select India-VoLTE-Vodafone or Telefonica_UK_Commercial, right-click and SetSelectedConfig for both Sub0 and Sub1

    7th - Click on the profile you selected (India) again and click on Activate
    Yes, select UK/India even if you are located in another region (see above for confirmed locations + carriers)

    8th -Close the PDC and go back to cmd/adb then type
    adb reboot

    and Boom! VoLTE is Working

  10. B0GD1
    Cupcake Sep 24, 2021

    B0GD1 , Sep 24, 2021 :
    Thanks Froyo. Did you get to activate VoWiFi too?

  11. herkulo
    Froyo Sep 24, 2021

  12. herkulo
    Froyo Sep 24, 2021

    Attached Files:

  13. hjegei
    Cupcake Oct 1, 2021

    hjegei , Oct 1, 2021 :
    Thanks. I tried this solution on my OnePlus 6 and everything went well during ADB, PDC, I could select and activate a new profile. After reboot, the new settings did not stick and when checking it is back to "Oversea-Commercial_DS" and no VoLTE. Any suggestions?

  14. K1633888200975
    Cupcake Oct 12, 2021

    K1633888200975 , Oct 12, 2021 :
    The same here. I don't think that I'm ever will get an OnePlus again.

  15. Artemus
    Community Hero 2020 Oct 12, 2021

    Artemus , Oct 12, 2021 :
    Do your carriers support VoLTE on the OP6 in the first place? It's a two-way street.

  16. K1633888200975
    Cupcake Oct 13, 2021

    K1633888200975 , Oct 13, 2021 :
    Yes, VoLTE and VoWiFi were perfect on OP6 under Android 10.

  17. johnnyrwth
    Cupcake Oct 15, 2021 at 10:47 PM

    johnnyrwth , Oct 15, 2021 at 10:47 PM :
    Hi all,

    using the PDC tool als "administrator" I can select the device but get the following error message:


    Anyone any idea what to do here?

    Why is VoLTE not activated per default on a OnePlus 6? Very annoying to have to go into these extremely IT specific (only IT nerds understand what to do here...) kind of operations...

  18. T1542139458092
    Cupcake Oct 18, 2021 at 10:15 AM

    T1542139458092 , Oct 18, 2021 at 10:15 AM :
    I solve this by remove Oversea-Commercial_DS, not only deactivate.