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

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By AnonymousTipster, Junior Member on 10th January 2019, 06:33 AM
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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=1dY...EBOjau1BRvtnJQ (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.
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10th January 2019, 06:37 AM |#2  
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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.
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10th January 2019, 07:37 AM |#3  
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This is great news! Did this method override the critical partitions in your test to fully convert? Did it become a full conversion or is it just another cool method to use the international Oxygen OS? You think OTA will work as normal now as well instead of doing a local upgrade and etc? Great job and excuse the numerous questions. I'm just curious and excited about this. I've been lurking in these related threads all this time and watching them progress. Lol
10th January 2019, 08:13 AM |#4  
@AnonymousTipster change the title from "conversation" to "conversion".

Amazing guide by the way, nice job.
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10th January 2019, 08:15 AM |#5  
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My tmo variant 6T is carrier unlocked and bootloader unlocked and converted to international via the old conversion method downloading the full OTA and flashing the "flash all" bin.

By using this MSM tool, after it locks up my bootloader again, can I still use my old unlock bin? Or will I have to request a new bin key from OnePlus?
10th January 2019, 08:17 AM |#6  
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I just tested this and can happily confirm that it works!!! Thank you!!!
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10th January 2019, 08:54 AM |#7  
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Quote:
Originally Posted by lemonspeakers

My tmo variant 6T is carrier unlocked and bootloader unlocked and converted to international via the old conversion method downloading the full OTA and flashing the "flash all" bin.

By using this MSM tool, after it locks up my bootloader again, can I still use my old unlock bin? Or will I have to request a new bin key from OnePlus?

The answer is two posts above yours. As the whole phone had been rewrote you have the international version and therefore don't need any bin key.
10th January 2019, 10:56 AM |#8  
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Besides using Magisk or another Launcher, is there a way to maintain the Google Now tab when swiping to the far right?
10th January 2019, 11:04 AM |#9  
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So, it's fully and 100% conversion? Meaning that full and incremental OTA's can get them worry free?
10th January 2019, 11:33 AM |#10  
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Quote:
Originally Posted by imrock666

So, it's fully and 100% conversion? Meaning that full and incremental OTA's can get them worry free?

Won't know until the next OTA is released, to date we are unable to get OTAs, but local upgrade works fine.
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10th January 2019, 11:35 AM |#11  
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Quote:
Originally Posted by Dark Nightmare

Won't know until the next OTA is released, to date we are unable to get OTAs, but local upgrade works fine.

Ok, so we will have to test until next one comes out? Gotcha!
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