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Unlocking/Locking Bootloader on Oneplus Nord CE 3 (Ziti)

Pranish
How to unlock or lock bootloader of oneplus nord ce 3 (ziti)

Warning ⚠️
I)DO NOT DOWNDRADE TO OxygenOS 13 AFTER UNLOCKING BOOTLOADER
II)BEFORE LOCKING BOOTLOADER MAKE SURE TO UNROOT IT

Items Required:

On to the steps:

  1. Make sure to backup your file (use PC/ SDcard/ Google backup/Swift Backupor whatever you wish) as unlocking or locking will erase internal storage.
  2. Enable the 'USB-debugging' and 'Allow Bootloader Unlock' options from the Developers option in additional settings and connect the device to the PC with USB.
    Info! To enable the developer option, open settings>about phone>version> tap version no. 7-8 times.
  3. Download latest SDK-Platform-tools and extract it in PC. Now open the extracted folder and open an elevated cmd/powershell window here using shift + right click>Open in the terminal.
  4. Use the command in the terminal
    adb devices
    If a pop-up appears on the phone, then click on allow.
    Again, use the same command you should see serial number of your device. This means the device is connected to the ADB interface successfully.
  5. Now follow the below commands:
    adb reboot bootloader
    Extra! You can also enter Bootloader/Fastboot Mode by pressing and holding all keys: volume +, volume - & power button. 
    fastboot devices
    To check that the device is connected, it will show its serial no.
    fastboot flashing unlock
    To unlock bootloader

    OR
    fastboot flashing lock
    To lock bootloader
    Info! Two options will appear on the phone to unlock/lock or not Using the volume keys, select Unlock/Lock and press the power button to confirm. 
    fastboot reboot
    To reboot device
    Extra! I) You may need these while relocking.
    II) To check current slot- fastboot getvar current-slot
    III) To change slots- fastboot --set-active=a write b in place of a if you want to flash in b slot instead of a.
  6. Done
Success! Enjoy bootloader will unlock now.

Video Tutorial for unlocking

Video Tutorial for locking


Credit: NordCE3 Community

Pranish

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