problem whith fastboot ( arc 4.0.4 )

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http://forum.xda-developers.com – 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 &l (HowTos)