[Q] xperia u st25i update problem topic

after updating my xperia u st25i it shows error. phone starts but no sim card can recognize and offline should be continue. after that i checked imei no...that is blank.....i shocked...then i have tried with re updating with service tool. but same problem. then i flashed it ST25i_6.1.1.B.1.100 Lee480 of XDA_2 with flash tool v0.9 . flash done but with an error. that is .......
WARN - This file is ignored : simlock.ta

now i am in a big problem. what can i do? please help immediately...