problem whith fastboot ( arc 4.0.4 )

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i have windows xp sp3 i do all steps to unlock bootloader of my phone arc ice cream 4.0.4
finally it can't unlocked and this message apear in cmd window:

C:\WINDOWS\system32\android\android-sdk-windows\tools\fastboot>fastboot.exe -i 0
x0fce oem unlock 0xD7AE1F4E5F54D15B
usage: fastboot [ <option> ] <command>

commands:
update <filename> reflash device from update.zip
flashall 'flash boot' + 'flash system'
flash <partition> [ <filename> ] write a file to a flash partition
erase <partition> erase a flash partition
getvar <variable> display a bootloader variable
boot <kernel> [ <ramdisk> ] download and boot kernel
flash:raw boot <kernel> [ <ramdisk> ] create bootimage and flash it
devices list all connected devices
reboot reboot device normally
reboot-bootloader reboot device into bootloader

options:
-w erase userdata and cache
-s <serial number> specify device serial number
-p <product> specify product name
-c <cmdline> override kernel commandline

http://forum.xda-developers.com/show....php?t=1304634