ZTE Icera unlocker

[attis75]

Hi all,
my unlock process error... :

Modem COM port : COM5
Mode : 0
CGMM name : K3806-Z
IMEI : 355587042675824
Firmware : EAGLE_R1.5.3.8_C
Full CGMR responce :
Modem mode
EAGLE_R1.5.3.8_C
EAGLE_R1.5.3.8_C
P4 rev: CL342434 with 0 local change(s).
Modem CDROM status : Enabled
Chipset platform : ICERA
Lock status: Locked (PH-NET PIN)

12:52:29.395 Unlock procedure started!

Connecting to server... OK
Reading modem IMEI... OK
Disabling modem CDROM... OK
Switching modem port mode... OK
Send data to server... OK
Read data from server... OK
Reading modem port mode... OK
Reading modem secure data... OK
Unlocking... failed!
Send data to server... OK
Read data from server... OK
Switching modem port mode... failed!
Send data to server... OK
Read data from server... OK
Disconnected from server!

12:52:33.213 Error!

Error code = 287

But my credits is deducted