huawei E303S HELP UNLOCK

Port : COM21 : HUAWEI Mobile Connect - 3G Modem #3
Baud Rate : 921600
Device : Huawei E303s
Operation : Read Info
Opening Port... OK
Reading Information... OK
Manufacturer : huawei
Model : E303S
Revision : 21.157.31.00.850
IMEI : 867648016643387
Build : Mar 28 2012 09:45:01
Software : 21.157.31.00.850
Dashbaord : UTPS21.005.20.02.850_MAC21.005.20.02.850_LNX21.005 .20.02.850
Hardware : CH2E303SM
Flash Code : 57550325
Lock Status : Unlocked (10 Attempts Left)

HOW TO UNLOCK?