Sony Ericssion Xperia Neo V not working after bootloader unlocked

Hello there,

I'm new to this topic. Please help me to solve my issue.

I've Sony Ericcssion Neo V (MT11i). Today I've unlocked the bootloader of it.
OS: Ubunty 14

When I first try to unlock the bootloaded the command "./fastboot devices" returns the following output:
BX902MZNFF&ZLP fastboot

Then I've tried to unlock the bootloader with the command "./fastboot -i 0x0fce oem unlock 0xB09B70A753C1E88E" it returns the following output on screen:
...
(bootloader) Unlock phone requested
(bootloader) Erasing block 0x00001300
(bootloader) Erasing block 0x00001400
FAILED (status read failed (No such device))
finished. total time: 6.173s

I've added the rules file 50-android.rules in /etc/udev/rules.d folder (I've added rules files for 51, 70 and 99 also) and executed the command chmod a+r for all the above files
I've did /etc/init.d/udev restart

Now my devices is not starting, its just blinking the screen with "Sony Ericcson"

./adb devices or ./fastbook devices returns nothing

Please help me to solve this issue.

Thank you.