Unlocked bootloader is needed for most custom ROMs and for ALL custom kernels. It allows the booting system to be changed. This can be done via official way or via test point method. Official way also removes DRM keys, which cannot be restored at all.
WARNING: You will lose warranty with this!
THE OFFICIAL METHOD - You lose DRM!
1. Go to http://unlockbootloader.sonymobile.com .
2. Enter service menu, open keypad and enter *#*#7378423#*#*.
3. Service Info - Configuration, Bootloader Unlock Allowed: Yes/No. If it says Yes, continue. If it says No, do not continue, because it will not work.
4. On the website, click "Start Unlocking the bootloader".
5. In the text, there are instructions, what you need to do. Also there are drivers that are needed for this process. Follow the instructions.
6. Install the drivers, then click Continue.
7. Enter your IMEI, name and e-mail. Leave out the last number from the IMEI.
8. You get a code, leave the website open, you will need this code.
9. Turn off your phone, then connect USB cable to your PC, hold down Volume UP button and connect USB cable to your phone. Blue LED should light up.
10. You will be asked for drivers. Point to the usb_driver folder where you placed the android_winusb.inf-file, and select the Android Boot loader Interface-file.
11. Open command prompt, first enter this Code: cd C:\...\android-sdk\platform-tools Replace C with the correct drive letter and ... with the path to the android-sdk folder. Next, enter this command Code: fastboot.exe -i 0x0fce oem unlock 0xKEY Replace KEY with the key that you got from the website.
12. Bootloader is now unlocked.
WARNING: You will lose warranty with this!
THE OFFICIAL METHOD - You lose DRM!
1. Go to http://unlockbootloader.sonymobile.com .
2. Enter service menu, open keypad and enter *#*#7378423#*#*.
3. Service Info - Configuration, Bootloader Unlock Allowed: Yes/No. If it says Yes, continue. If it says No, do not continue, because it will not work.
4. On the website, click "Start Unlocking the bootloader".
5. In the text, there are instructions, what you need to do. Also there are drivers that are needed for this process. Follow the instructions.
6. Install the drivers, then click Continue.
7. Enter your IMEI, name and e-mail. Leave out the last number from the IMEI.
8. You get a code, leave the website open, you will need this code.
9. Turn off your phone, then connect USB cable to your PC, hold down Volume UP button and connect USB cable to your phone. Blue LED should light up.
10. You will be asked for drivers. Point to the usb_driver folder where you placed the android_winusb.inf-file, and select the Android Boot loader Interface-file.
11. Open command prompt, first enter this Code: cd C:\...\android-sdk\platform-tools Replace C with the correct drive letter and ... with the path to the android-sdk folder. Next, enter this command Code: fastboot.exe -i 0x0fce oem unlock 0xKEY Replace KEY with the key that you got from the website.
12. Bootloader is now unlocked.
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