Unlocking & Relocking the bootloader of Xperia Z & ZL ( the official way )


how to unlock official way

  1. Go to: http://unlockbootloader.sonymobile.com/ and read everything!
  2. At the bottom click ‘Start Unlocking the Bootloader’
    Quote:
    First, you should confirm that it is possible to unlock the boot loader 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.

  3. after u have verified that u can unlock bootloader, scroll to the bottom of the page and click “Continue”
  4. you will get numerous prompts, read all info and if u agree click on “Accept”/”OK”/”Proceed”
  5. finally u will get a “Create Unlock request” page, enter your IMEI (sometimes the last digit needs to be removed for this to work), name and email address
  6. You should now receive your unique unlock key via EMAIL, SAVE THIS KEY SAFELY
  7. Extract fastboot_with_Android_USB_file.rar and open fastboot folder
  8. Hold SHIFT and right click on the background of the folder
  9. Select ‘Open command window here’
  10. Connect your phone in fastboot mode (turn phone off, hold Volume UP button and plug in USB Cable) [make sure drivers are installed as explained above)
  11. In the cmd windows type in fastboot.exe -i 0x0fce getvar version
  12. If a value is returned (it will return 0.5), it means the phone is correctly connected
  13. Type in fastboot.exe -i 0x0fce oem unlock 0xKEY and replace KEY with the key which u received earlier.
  14. You’re device should now be bootloader unlocked

Download:fastboot package with Android usb drivers

 

why to unlock bootloader?

  • u can flash custom ROMs/Kernels
  • u dont need to worry if the new firmware can be rooted or not as with unlocked bootloader u can always ROOT ur device
  • Sony gives sneak-peaks/preview builds of latest OS which requires unlocked bootloaders, as they did with Xperia 2011/2012 line, so who knows may be Sony may give early builds of next android OS

Warning!

  • This procedure will wipe the /data partition of your phone, so you will loose all ur stored data, settings. SDCARD will BE WIPED!!!
  • For Xperia  devices released 2013 or later (for example Xperia™ Z and Xperia™ ZL), the SD card of your device will be formatted and you will lose all content (for example photos, music, videos) when you unlock the boot loader.
  • Lose DRM keys means. no more Music ID/Gracenote within the Walkman app plus probably most importantly, as asked all the time and all over the place in the T/mint forums: loss of Bravia Engine.
  • older Xperia devices sometimes got issues after unlock of bootloader (BRICK after FOTA update) – you have been warned
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