Cant unlock bootloader
Hi, a few weeks back i relocked my bootloader using flash tool as i was going to sell the phone and wanted OTA updating working. However i am now keeping the phone and whenever i try to unlock the bootloader using either sonys official method or flash tool it gives me a error and if i try again it tell me that the device is already rooted. As it stands the device is totally stock. Any ideas how to unlock the bootloader?
EDIT: these are the errors i recieve
14/023/2014 01:23:49 - INFO - FAILED (remote: Command did not succeed)
14/023/2014 01:23:49 - INFO - finished. total time: 0.018s
14/023/2014 01:23:50 - INFO - Unlocking phone using key 01EC98059D9E4CA4
14/023/2014 01:23:50 - INFO - ...
14/023/2014 01:23:50 - INFO - FAILED (remote: Device is already rooted)
14/023/2014 01:23:50 - INFO - finished. total time: 0.004s