Unlock Bootloader for Xperia x10/x8/pro/mini

Before Unlocking the bootloader
Be sure that it is safe to unlock for your device
Remember this tutorial is only for Xperia x10/ x8/ pro/ mini only

In order to check whether it is safe to unlock or not 

1. First you need S1 tool [you can download here] and open it

2. Then click on identify button

3. After clicking identify you will see below message

4. Then switch off your mobile and connect to PC pressing and holding back key [glows green led light]

5. Then you'll see running s1_LOADER VER R4AO62  and  SEMC SIMLOCK CERTIFICATE

6. In your device if bootloader is locked then you will find capital R in running s1_LOADER VER R4AO62, if you find small r then your bootloader is unlocked

7. If you can see SEMC SIMLOCK CERTIFICATE then you can proceed for bootloader unlock process

# Only proceed if above requirements passes

Process to unlock bootloader

1. First download flash tool V0.6.8.0 [you can download here] and install it

2. After installation, go to driver folder and install the driver which is inside it

3. Then in mobile, turn on USB debugging

4. Open flashtool

4. Then connect mobile to PC and wait till flashtool recognizes it

5. Then go to Plugins> Bootloader Unlock> Run

6. Then you'll receive a message and follow it

7. Then unlock process begins and wait till this process completes.

Wait until Flashtool ask you to disconnect the cable off 
the phone, then turn on the device and connect the usb cable once again

8. Then flash tool says "Successfully applied unlock Rebooting" 

9. This means your bootloader is unlocked now

Now lets check whether bootoader is really unlocked?

1. Once again run flashtool

2. Click on Identify button

3. After clicking identify you will see below message

4. Then switch off your mobile and connect to PC pressing and holding back key [glows green led light]

5. Then you'll see running s1_LOADER VER r9AO62, in which r is now on small letter

6. And its proved that bootloader is unlocked....