huawei nova smart dig-l01

hi,
i have problem with this phone, i can't restore the original imei:
SigmaKey 2.27.10 Qcom: Repair IMEI
DBAdapter Reserved Interface (COM34), Provider: Huawei Incorporated, Driver ver.: 2.0.6.725, Date: 28/11/2016, USB\Vid_12D1&Subclass_11&Prot_23
Removing firmware protection...Unable to connect to the server. Please check your network.
any one can help me? thank you