How to relock bootloader of any Lenovo devices - Lenovo Z5/Z5 Pro

Now you can relock bootloader easily by following this simple guide. Official Bootloader lock for any Lenovo device will also void the device warranty. So if you planning to relock Bootloader On Lenovo device, then it’s always better to wait until your warranty gets over. In case if you have unlocked the bootloader, then you can always relock the bootloader on your device anytime.

Requirements:

To relock Bootloader On Lenovo, you need a laptop or PC.

Charge the Lenovo device to a sufficient battery level to avoid any sudden shutdowns during the process.

We strongly recommend you to take a complete full backup of your personal data, including the internal storage. The phone will be formatted, so be prepared for it. You can also follow our Android backup guide for the same.

You need a USB cable to connect your phone to PC.

Required Files on your PC:

You need to download ADB and Fastboot Tools to your PC and Extract it

Download Lenovo USB Drivers

Steps for How to Unlock Bootloader On Lenovo Z5 (L78011)

1. First of all, enable the Developer Option

2. To Enable the Developer Option, Go to your Settings -> About -> Software Information -> More -> Now Tap on the Build Number 7-8 Times until you see a toast message “Developer option enabled“

3. Go back to settings -> Now you need to enable the OEM Unlock by going to Settings -> Developer Option and Enable OEM Unlock and USB Debugging

4. Download and Extract the Downloaded ADB fastboot Zip file on your PC.

5. Now connect your phone to Computer using USB Cable.

When you connect your Phone to Computer, please wait until all the drivers get installed.

6. In your ADB fastboot folder open a command prompt window by pressing Shift Key + Right Mouse Click 

7. Now type the command in your command window

adb devices

8. If you see a pop up to allow USB Debugging on your phone, Click OK pop up to allow USB Debugging 

9. Now type the command below to reboot your phone to bootloaderadb reboot bootloader

adb reboot bootloader

10. Once your phone reboot into bootloader, make sure your phone shows the bootloader unlocked and then type the command below to make sure fastboot drivers are installed properly.

fastboot devices

11. This command will list the connected devices. If your phones serial number shows up you are good to go and may continue. If the phone is NOT listed this indicates that your drivers are not installed correctly. In order for you to continue, you must fix your drivers so that your phone is listed under fastboot devices.

12. If the phone has been recognized by the command above, proceed to unlock the bootloader with the following command:

#Remember that this step will wipe EVERYTHING off the phone 

fastboot flashing lock_bootloader

13. After the above command has finished executing, run the following.

fastboot reboot

The phone will reboot. Wait until the phone has fully booted up into Android, and enjoy!

I hope this guide was helpful to relock Bootloader On Lenovo devices. If you have any queries or feedback, please leave a comment below.