How to unlock bootloader for OnePlus smart Phone

Step1. Make sure you have unlock your SIM card

Learning how to unlock SIM from T Mobile

https://www.t-mobile.com/responsibility/consumer-info/policies/sim-unlock-policy

https://support.t-mobile.com/docs/DOC-14011

Step2. Enable “OEM unlocking” from Settings UI

Settings > System > Developer options > OEM unlocking

Step 3. Get IMEI by dial *#06#


Step 4. Enter fastboot mode to get unlock code

  1. Download “fastboot_windows.zip” and unzip it on your computer. Remember the “root directory ”

  2. Power off your OnePlus 6T. Press and hold“Volume +”and “Volume -”.Then Press power key to enter “fastboot mode”

  3. Connect to your computer > Command:cd “root directory ”> Command: fastboot.exe oem get_unlock_code


Step 5. Provide your IMEI and unlock code to get the unlock token



OEM Unlock Service Webpage (Link)

Step 6. Enter fastboot mode to flash unlock token

Command: fastboot flash cust-unlock <unlock_token.bin>

Expected result:

Step 7. Unlock your device. 

Command: fastboot oem unlock 

Expected result: 

FAQS

Q1: Why do I need to apply for a token?

Answer: If you want to root your device or flash a customer ROM, OEM unlock is the first technical step for those operation after you have the SIM unlocked. Please note that:

  1. OEM unlock service is provided for T-Mobile version user, non TMO user can unlock the device without this service.

  2. Unlock device is not a totally safe operation, there are risks in this unlock operation. So, please be very careful to do this operation.

Q2: When can I receive the token after application?

Answer: We will send the token to your email address which you provided in the OEM unlock service webpage in 7 days after you completed the submission.

Q3: Will my device under the warranty after unlocking?

Answer:

  1. This is only for T-Mobile Edition user.

  2. For carrier devices, the operation of unlock the bootloader might against the carrier’s warranty limited. Please contact OnePlus customer support for further help once your device encounters technical issue after unlocking. OnePlus customer support

Q4: Any risks after unlocking the bootloader?

Answer: Please be aware that OnePlus couldn't guarantee the full functionality, and will not be responsible, for any 3rd unsigned custom ROM being flashed to your device after the bootloader is unlocked. An unsigned 3rd custom ROM may not have gone through the thorough tests that we run for each device and software version that we release.

Also, a 3rd custom ROM might not work properly on your device, and certain functions and offerings may cease to work. The performance and your data of the device might also be affected, and you may damage your device permanently. In worst case, unlocking the bootloader will cause physical injuries or material damage, for example, due to the device overheating.
The secure user data partition may also become inaccessible, and you will not be able to get any more official software upgrades if you unlock the bootloader.

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