Convert kb2007 (NA, T-Mobile) to kb2005 (NA, OnePlus) for dual sim dual volte/vowifi, possible?

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jllll

Member
Aug 18, 2022
18
7
I read some xda/reddit posts on this topic. It seems:
- OOS 11 is the only option to stably run kb2005 (oneplus dual sim) firmware on kb2007 (tmobile single sim). And a dual sim card tray can be used so that the second sim works for volte/vowifi (wifi calling).
- MSM Tool is the way to go to flash kb2005 firmware on a kb2007 phone to rebrand as EU version KB05BA, per this thread https://forum.xda-developers.com/t/...m-unlock-or-bootloader-unlock-needed.4188491/ . From there, kb2005 firmware can be installed with Local Update option.
- If OOS12 is installed and rollback is needed then this thread is very helpful https://forum.xda-developers.com/t/downgrade-oneplus-8t-kb2005-from-12-to-11-stable.4424381/

Does this sound about right? Or am I missing something on this issue? Thanks in advance!
 
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jllll

Member
Aug 18, 2022
18
7
Okay the device has arrived. I plan to stay on OOS11 for a while. 1) No real benefit added by OOS12; 2) VoLTE and Wifi Calling on US carriers like T-Mobile have been reported stabler on OOS11.

Below are the steps I took:

1. Use EU MSM tool; follow the instructions here (run MSM tool .exe file with administrator permission; can use adb tool to get into edl mode easily): https://forum.xda-developers.com/t/...m-unlock-or-bootloader-unlock-needed.4188491/
2. Download Oxygen Updater, from the device list, select oneplus 8T;
3. Enable advance option in Oxygen Updater; now kb2005 firmware should pop up, download it, and then follow the instructions about "local update" using this file.


oops this automatically brings me to OOS12.
Trying the OnePlus official rollback apk now...
Okay rollback apk doesn't work and quits when I click any firmware.

These are the correct steps:
0. Use carrier unlock from the setting to unlock T-Mobile carrier lock first.
1. Use EU MSM tool; follow the instructions here (run MSM tool .exe file with administrator permission; can use adb tool to get into edl mode easily): https://forum.xda-developers.com/t/...m-unlock-or-bootloader-unlock-needed.4188491/ note: after reboot I have dual VoWifi working already on KB05BA firmware.
2. Just use system update if it is showing 11.0.13.13.KB05BA.

This sticks to the EU firmware, as dual VoWifi already works on T-Mobile USA.
 
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JerryRich

New member
Sep 17, 2022
3
0
Hello, could you confirm that dual sim is working by following the steps above? I just received my T-Mobile 8T yesterday and found out it has only one sim slot.
 

jllll

Member
Aug 18, 2022
18
7
Yes, it was actually just that simple. SIM unlock. MSM tool. And one system update.

You might have to be careful with the last part tho because the latest system update may bring you to OOS12 and dual SIM will break. You might need to search for Oxygen updater and find a way to update to the latest OOS11 firmware. Oh also Global is the best among all firmware versions.
 
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JerryRich

New member
Sep 17, 2022
3
0
Yes, it was actually just that simple. SIM unlock. MSM tool. And one system update.

You might have to be careful with the last part tho because the latest system update may bring you to OOS12 and dual SIM will break. You might need to search for Oxygen updater and find a way to update to the latest OOS11 firmware. Oh also Global is the best among all firmware versions.
Thank you so much
 

JerryRich

New member
Sep 17, 2022
3
0
I followed the steps above but for some reason the Oxygen Updater still update my device to OOS12. I managed to downgrade back to OOS 11. I am still waiting for my dual sim tray from Amazon. Just to confirm, the latest OOS is 11.0.13.13.KB05AA right? Also, on the "About phone" page, the model is still KB2007, is this ok?
 

jllll

Member
Aug 18, 2022
18
7
I followed the steps above but for some reason the Oxygen Updater still update my device to OOS12. I managed to downgrade back to OOS 11. I am still waiting for my dual sim tray from Amazon. Just to confirm, the latest OOS is 11.0.13.13.KB05AA right? Also, on the "About phone" page, the model is still KB2007, is this ok?
I am on 11.0.13.13.KB05BA EU firmware. On www.oneplus.com the latest stable firmware is 11.0.13.13.KB05AA for global https://www.oneplus.com/global/support/softwareupgrade/details?code=PM1605596915581

My next update notification is for KB2003_11.C.33 which is OOS12.

About phone shows KB2007 for me as well but I have dual VoWifi on T-Mobile.

Waiting for a genius making dual SIM work again on OOS 12...
 
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  • 1
    Yes, it was actually just that simple. SIM unlock. MSM tool. And one system update.

    You might have to be careful with the last part tho because the latest system update may bring you to OOS12 and dual SIM will break. You might need to search for Oxygen updater and find a way to update to the latest OOS11 firmware. Oh also Global is the best among all firmware versions.
    1
    I followed the steps above but for some reason the Oxygen Updater still update my device to OOS12. I managed to downgrade back to OOS 11. I am still waiting for my dual sim tray from Amazon. Just to confirm, the latest OOS is 11.0.13.13.KB05AA right? Also, on the "About phone" page, the model is still KB2007, is this ok?
    I am on 11.0.13.13.KB05BA EU firmware. On www.oneplus.com the latest stable firmware is 11.0.13.13.KB05AA for global https://www.oneplus.com/global/support/softwareupgrade/details?code=PM1605596915581

    My next update notification is for KB2003_11.C.33 which is OOS12.

    About phone shows KB2007 for me as well but I have dual VoWifi on T-Mobile.

    Waiting for a genius making dual SIM work again on OOS 12...
  • 2
    Okay the device has arrived. I plan to stay on OOS11 for a while. 1) No real benefit added by OOS12; 2) VoLTE and Wifi Calling on US carriers like T-Mobile have been reported stabler on OOS11.

    Below are the steps I took:

    1. Use EU MSM tool; follow the instructions here (run MSM tool .exe file with administrator permission; can use adb tool to get into edl mode easily): https://forum.xda-developers.com/t/...m-unlock-or-bootloader-unlock-needed.4188491/
    2. Download Oxygen Updater, from the device list, select oneplus 8T;
    3. Enable advance option in Oxygen Updater; now kb2005 firmware should pop up, download it, and then follow the instructions about "local update" using this file.


    oops this automatically brings me to OOS12.
    Trying the OnePlus official rollback apk now...
    Okay rollback apk doesn't work and quits when I click any firmware.

    These are the correct steps:
    0. Use carrier unlock from the setting to unlock T-Mobile carrier lock first.
    1. Use EU MSM tool; follow the instructions here (run MSM tool .exe file with administrator permission; can use adb tool to get into edl mode easily): https://forum.xda-developers.com/t/...m-unlock-or-bootloader-unlock-needed.4188491/ note: after reboot I have dual VoWifi working already on KB05BA firmware.
    2. Just use system update if it is showing 11.0.13.13.KB05BA.

    This sticks to the EU firmware, as dual VoWifi already works on T-Mobile USA.
    1
    I read some xda/reddit posts on this topic. It seems:
    - OOS 11 is the only option to stably run kb2005 (oneplus dual sim) firmware on kb2007 (tmobile single sim). And a dual sim card tray can be used so that the second sim works for volte/vowifi (wifi calling).
    - MSM Tool is the way to go to flash kb2005 firmware on a kb2007 phone to rebrand as EU version KB05BA, per this thread https://forum.xda-developers.com/t/...m-unlock-or-bootloader-unlock-needed.4188491/ . From there, kb2005 firmware can be installed with Local Update option.
    - If OOS12 is installed and rollback is needed then this thread is very helpful https://forum.xda-developers.com/t/downgrade-oneplus-8t-kb2005-from-12-to-11-stable.4424381/

    Does this sound about right? Or am I missing something on this issue? Thanks in advance!
    1
    Yes, it was actually just that simple. SIM unlock. MSM tool. And one system update.

    You might have to be careful with the last part tho because the latest system update may bring you to OOS12 and dual SIM will break. You might need to search for Oxygen updater and find a way to update to the latest OOS11 firmware. Oh also Global is the best among all firmware versions.
    1
    I followed the steps above but for some reason the Oxygen Updater still update my device to OOS12. I managed to downgrade back to OOS 11. I am still waiting for my dual sim tray from Amazon. Just to confirm, the latest OOS is 11.0.13.13.KB05AA right? Also, on the "About phone" page, the model is still KB2007, is this ok?
    I am on 11.0.13.13.KB05BA EU firmware. On www.oneplus.com the latest stable firmware is 11.0.13.13.KB05AA for global https://www.oneplus.com/global/support/softwareupgrade/details?code=PM1605596915581

    My next update notification is for KB2003_11.C.33 which is OOS12.

    About phone shows KB2007 for me as well but I have dual VoWifi on T-Mobile.

    Waiting for a genius making dual SIM work again on OOS 12...