how can i unlock alcatel onetouch 888A with sigma key help

how can i unlock alcatel onetouch 888A with sigma key

always eroor mesage

--- 2014-08-06 10:19:00 ---

SigmaKey 2.04.00 MTK: Direct unlock

MTK USB Port (COM7), Provider: MediaTek Inc., Driver ver.: 1.1032.0.0, Date: 7/27/2010, USB\VID_0E8D&PID_0003&REV_0100

Baud rate: 19200

Release "Power on" button!

Baseband Processor: MT6235, HW Rev. B.00, SW Rev. A.01

Serial number: F29428FD5B20AFD8F21FD54E9C98E3E6

Sending boot...Error writing to serial port



help

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