How To Unlock Bootloader in Sony Xperia phone?

Necessary Tools, Drivers and Firmware

  1. Sony Xperia PC Companion with USB Drivers
  2. Sony FlashTool 32bit
  3. Sony FlashTool 64bit

Install Necessary Tools

  1. Install Sony Xperia PC Companion with USB Drivers. 
  2. Unpack and install Sony FlashTool.

WARNING!
Bootloader Unlock on the phone will erase all of your data.
All described operations you are doing at your own risk.
If want saves your data do a backup before start.
The battery should be at least 60% charged before starting.

Obtaining the Bootloader Unlock Code from Sony

  1. Read IMEI from phone label, or dial *#06# code. Save it, will be needed in next step.
  2. In your phone, open the dialer and enter *#*#7378423#*#* to access the service menu.
  3. Tap Service info > Configuration > Rooting Status.
    If Bootloader unlock is "Yes", then you can continue to the next step. If it says No, or if the status is missing, your device cannot be unlocked.
  4. Go to page Sony Developer Bootloader UnlockSony developer page for get bootloader unlock code part1
  5. On the drop down menu select your model and press Continue button.Sony developer page for get bootloader unlock code part2
  6. Next enter your e-mail address to get a required link for next step, check Terms & conditions and press Submit button.

    Sony developer page for get bootloader unlock code part3

    Sony developer page for get bootloader unlock code part4

    Sony developer page for get bootloader unlock code part5
  7. Next, open an e-mail with a received link from Sony and open it to go to next step.Sony developer page for get bootloader unlock code part6
  8. On that page write your IMEI number, check Terms & conditions check all checkboxes and press Submit button.

    Sony developer page for get bootloader unlock code part7

    Sony developer page for get bootloader unlock code part8

  9. Now you will see the bootloader unlocking code, save it, you will need it in the next step.Sony developer page for get bootloader unlock code success
  10. Great work now we can start unlocking bootloader process.

Bootloader Unlock Manual

  1. Turn on Sony FlashTool(depend on windows system 32/64bit use file Flashtool or Flashtool64).
  2. Press BLU button and holding volume down button connect turned off the phone to USB cable.

    Sony FlashTool BLU button arrow

    Sony FlashTool flash mode tutorial

  3. Now the software will read information about your Sony phone and write you manual to connect the phone in fastboot mode.
  4. Release volume button and disconnect USB cable from your phone.Sony FlashTool fastboot mode tutorial
  5. Connect your Sony phone turned off to the USB cable with the volume up button pressed until the tutorial disappears, then release the volume button and leave the phone connected to the USB cable.
  6. Next, you will see the new window with phone imei filed and blank filed to enter bootloader unlock code.Sony FlashTool bootloader unlock code filed
  7.  Enter bootloader unlock code that you save before and press Unlock button.Sony FlashTool bootloader code entered unlock button
  8. Wait until you will see a welcome screen on the phone, then disconnect USB cable.Sony FlashTool bootloader unlock success

Congratulations, everything went well and your phone has unlocked Bootloader.
Then you can upload custom recovery, root your phone or upload custom firmware.

By Wojtek Góralczyk on Jan 12, 2018