[OnePlus 6T  Guides, News, & Discussion] publich:
I am a noob trying to unlock the bootloader of the oneplus 6T (renewed Tmobile) I have just bought from Amazon. After got the unlock tocken(.bin) file from Oneplus support, I did the command:

./fastboot flash cust-unlock ../unlock_code.bin

Sending 'cust-unlock' (0 KB) OKAY [ 0.005s]

Writing 'cust-unlock' ^C

^C^C^C^C^C^C

So the fastboot program is hung when writing to the bootloader flash flash I guess. After powering down the phone, I can't power it up anymore.

Can someone please shoot me a procedure to recover from this ... really appreciate your help for a new member on this!!!

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update:

As a courtesy, I am hrer to update with a resolved status so that others can be aware of:

1) Google online for a more intuitive introduction and step by step guide on how to use MSM tool to update bootloader(s). There are multiple stages of bootloading and each has one bootloader.

2) It is not hard to get the MSM tool to see the device connected. But it is common that the tool can't update the device bootloaders/images, with the error "Sahah protocol ... " type of message. THe reason I guess is the following.

3) It is very hard to be sure if your device is in EDL mode just right for the MSM tool to talk to. I don't know what stage the device has to be in for the MSM to work correctly. It is very hard to even know what stage the device is in. SO VERY SADLY, it is a try and error and retry game. Many suggested things to try but I found the most useful one is the volume up and down button pressed together and then with power button, ALL THREE pressed for some seconds after the device is powered down. But you don't even know how long it takes to power down the device .... etc. So try the all three button procedure as many as you, with luck you will be able to see that the MSM tool will start to update.

4) I am brandnew noob in the android world. There are so much to learn about this giant world of android-ing. There are so many terms (technical/no-tech), versions of kernel/OS/Apps/Framework/devices/vendors/ROMs/etc. Instructions online are very helpful, but some of them are obsolete (be careful). Some of them are not detailed enough and some of them are just an experience of one try and some of them ..... it is not as straight forward as you imagined (as always in the software/hardware world).

5) I still am not sure what caused the failure of my first try to unlock the 6T. I guess it is due to the fact that I did it on Linux and it hasn't got an update driver. Eventually I did the unlock on Windows 10.

Some other useful links:

[Ultimate-Guide] ★ OnePlus 6T OOS-10 TWRP-Root-Magisk from OOS-9

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[OP6T][LATEST 10.3.7] Collection of unbrick tools

Disclaimer: By attempting any of the processes listed in this thread you accept full responsibility for your actions. I will not be held responsible if your device stops working, catches fire, or turns into a hipster and claims to have been...

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