enabling usb debugging when device is off I am trying to unlock my bootloader, but I am unable to enable usb debugging because my device (xperia t) is not coming on.
How do I unlock my bootloader so that I can flash it.
For device recovery purposes use original stock ROM images. Flashing of original ROM does not require unlocked bootloader. 

The bootloader being locked means that it would only allow flashing of vendor signed images. And by definition the original images are vendor signed.