Sony Xperia Z1 is Sony’s latest flagship device after the huge success of the Xperia Z. It has a 5″ screen with a resolution of 1080×1920 pixels. It is powered by a Snapdragon 800 Quad-core 2.2 GHz Krait 400 processor along with a 2GB of RAM. It has 16GB internal memory which is expandable up to 64GB. To top it off, it has an amazing 20.7MP primary camera.

Previously, we have seen how to root the Sony Xperia Z1. If you want to install custom ROMs, kernels on this device, you will have to unlock the bootloader of the Xperia Z1. Another advantage is that Sony gives sneak-peaks/preview builds of latest OS which requires unlocked bootloaders. So if you want to unlock the bootloader of Sony Xperia Z1, follow the instructions given below.

Xperia Z1

Disclaimer: Follow the instructions at your own risk. The writer cannot be held responsible for any bricked or unusable devices. Even though the chances of your Smartphone getting bricked are negligible, the owner of the device must take full responsibility of it!

Note:

  • Unlocking the bootloader will wipe your device. Make a proper backup.
  • Also, the camera app might not work. So make a backup of TA partition before unlocking the bootloader and then restore the TA partition after the bootloader has been unlocked (Follow this tutorial).

Pre-requisites and Backing up your Xperia Z1:

Requirements:

Steps to Unlock the Bootloader of Xperia Z1:

  1. Find the IMEI code for your device. Type *#06# in phone dialer to find it out and note only the digits.
  2. Download the fastboot zip file on your computer.
  3. Go to: http://unlockbootloader.sonymobile.com/.
  4. First, you should confirm that it is possible to unlock the bootloader of your phone by checking the service menu. In your phone, open the dialler and enter *#*#7378423#*#* to access the service menu.
    In your phone, tap Service info >> Configuration >> Rooting Status. If Bootloader unlock allowed says Yes, then you can continue with the next step. If it says No, or if the status is missing, your device cannot be unlocked.
  5. If it says Yes then on the Sony website at the bottom click “Start Unlocking the Bootloader” and then click continue.
  6. Many prompts will appear. Just proceed ahead.
  7. You will fina a “Create Unlock request” page, enter your IMEI name and email address.
  8. After some time, you will receive a unique unlock key in the email. Save it.
  9. Now extract the fastboot folder to a convenient location on the computer.
  10. Enter the phone into fastboot mode by switching it off and then hold Volume up button.
  11. Connect the phone to the computer and let the drivers properly install.
  12. Open the fastboot folder and then start a command prompt here by holding shift and right clicking on the background of the folder.
  13. In the command prompt type the following code and press enter:
    fastboot.exe -i 0x0fce getvar version
  14. Now type the following command and replace the “key” in the command with the unique unlock key you received in the email:
    fastboot.exe -i 0x0fce oem unlock 0xKEY
  15. Done! Disconnect the phone and then reboot.

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