Proble unlock Huawei ascend P6-U06 (Error writing to serial port)


i have a problem with this unlock

SigmaKey v.2.15.04
325666752 Sigma dongle 2.15, Initializing…OK
Pack 1: Activated
Pack 2: Activated
——— 2016-02-26 12:34:20 ———
SigmaKey 2.15.04 HiSi: Direct unlock
Connecting…..Error writing to serial port

The port is installed correctly with sigma support drivers for HiSilicon devices.

Any idea?