Xperia LT15i Unlock Failed Any have Solution??

[SouthE]

PROCESSING ...
REMOVE TESTPOINT NOW, THEN PRESS "READY"

PLEASE ATTACH TURNED OFF PHONE NOW
PRESS AND HOLD "BACK" OR "VOLUME DOWN" BUTTON ...

RUNNING S1_LOADER VER "R4A069"

EROM_AID : 0001
LOADER_AID : 0001
HWCONF_AID : 0001
ACTIVE_LOADER_AID : 0001

DEVICE ID: AB1AD4DCB4681AD49D4CC050A7D1C655B73C4CC3
FLASH ID: "002C/00B3"
LOADER VERSION: "r4A069"

PHONE IMEI : 01268200491597
Checking for signature ...
Waiting for calculation process ...
request denied.
signature calculation not done,err: 144
Unlock FAILED