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T-Mobile 6T to International Conversion (WITHOUT unlocked bootloader/SIM unlock!)

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May 7, 2021
Wondering anyone knows after converting to international version, would 6t see Galileo GPS signal in US? The hardware of 6t supports A-GPS, GLONASS, BDS, GALILE. Yet, after repeated inquiry to Oneplus Support, without getting any answer. They pretended not understanding the question. Or anyone knows how to make them work?


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Jan 23, 2022
so after i tried this i did smething wrong and i bricked my phone. i unbricked it and after using the tmobile msm tool my wifi doesnt want to work or even turn on and i cant find a way to turn it on. any help is appreciated

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    In the previous thread, we discussed a method to convert T-Mobile 6T's to the international variant, sort of, but it required an unlocked bootloader, which itself requires a SIM unlock which T-Mobile gives people a hard time about.

    However, it is through @Dark Nightmare and @iaTa's efforts that we've come this far. Today, I share with everyone a new method to turn a T-Mobile 6T into an international variant. One that does NOT require an unlocked bootloader or a SIM unlock!

    Before you proceed: Following the steps below WILL wipe your phone. Please backup all of your important files from the phone before proceeding.

    Here are the steps:
    1) Download 6T MsmDownloadTool v4.0.58 (OOS v9.0.11) provided by @iaTa
    2) Download patched flasher tools here: https://drive.google.com/open?id=1dYuVxnf_J97KPrRt6KEBOjau1BRvtnJQ (the patches simply remove checks that allow all the images to be flashed on the phone, I've personally tested the "MsmDownloadTool V4.0_factory_patched.exe" but not the "MsmDownloadTool V4.0_factory_mcl_op1_patched.exe" variant. You can do a binary diff on the EXEs against the originals in case there's any issues with trust.
    3) Shut down your T-Mobile 6T completely
    4) Press and hold Volume Up and Volume down keys simultaneously
    5) With those two buttons held down, plug in your USB cord to your PC
    6) Ensure that the USB drivers for Qcom download mode are installed and working (available in the MSMDownloadTool thread)
    7) Extract the patched tools EXEs to the same directory as where you extracted the MSMDownloadTool
    8) Run "MsmDownloadTool V4.0_factory_patched.exe" (or the other one, if you're feeling adventurous)
    9) Click "Start" when you're ready to start patching the phone
    10) After about 5 minutes it will finish its job and reboot the phone
    11) Phone will boot normally, but no more T-Mobile logo, and instead there is the OxygenOS generic logo
    12) Now your T-Mobile 6T is now running identical software to the unlocked 6T sold directly by OnePlus, and running the latest software (OxygenOS 9.0.11 at the time of this writing). You can even participate in Open Betas if you'd like, and the "Local Upgrade" feature is now enabled and working.
    13) ???
    14) Profit

    Hope this helps somebody out.

    It definitely works.
    If you want to unlock bootloader after it's converted, then it's just a simple fastboot oem unlock WITHOUT having to wait 7 days for OnePlus unlock bin. Just like the 6T sold by OnePlus directly. And you can even load a dual-SIM tray and both SIM slots work normally.
    I created a video tutorial for those who may be having issues or struggling with the process. Enjoy!
    Note: It's currently still processing, so the quality will be improved when that's complete.

    NOTHING is wrong or missing in the instructions; follow them EXACTLY..
    Use winzip NOT winrar..Make sure your computer has the QUALCOMM driver installed
    Make sure your pc sees your phone.
    Use the cable your phone came with
    Try a different USB port

    If this doesnt work for you, its YOUR fault, not the instructions or the OP's fault
    I don't have the T-Mobile 6T, but on top of giving an idea, I wanted to say congratulations!

    Now as for an idea, if you guys want to see if OTA updating works, couldn't you guys:

    1. do the conversion
    2. downgrade with an older msm tool
    3. reboot and test software update in the os

    That way you won't have to wait to see if it works?

    Edit: If you're searching for a downgrade, I've been collecting all factory images and MSMTool for the 6T here: https://www.androidfilehost.com/?w=files&flid=285795

    The one that will take you to the original OxygenOS (9.0.5) for the non T-Mobile variant is in the "OxygenOS MSMDownloadTool" folder named "oneplus6t_fajita_oxygen_41_o.11_181103.zip"