*Your internal data will be erase after doing this
- Go to: http://unlockbootloader.sonyericsson.com/instructions. At the bottom click 'Continue' and enter your IMEI (type *#06# to find out), name and email address.
- You should now receive your unique unlock key. Note this down.
- Download and Extract fastboot.rar from here and open fastboot folder.
- Hold SHIFT and right click on the background of the folder
- Select 'Open command window here'
- Connect your phone in S1 Fastboot mode (turn phone off, hold [volume up] button and plug in USB Cable to the computer.) Make sure that the blue LED is on after plugging-in!
- Now windows ask you to locate the drivers. Locate and install the drivers from here.
- Enter fastboot.exe -i 0x0fce getvar version in the command prompt from step 5, and verify that you get a response back (for example "0.3"). This means your phone is connected properly.
- Type in fastboot.exe -i 0x0fce oem unlock 0xKEY and replace KEY with the key provided in step 2 and wait.
- And voila!!! Your device should now be bootloader unlocked!
