ldn-l21 imei repair failed

--------- 2018-05-14 14:12:22 ---------
SigmaKey 2.27.19 Qcom: Repair IMEI
DBAdapter Reserved Interface (COM261), Provider: Huawei Incorporated, Driver ver.: 2.0.6.714, Date: 28/12/2015, USB\Vid_12D1&Subclass_11&Prot_23
Removing firmware protection....Phone model: Qcom; LND-L21
Unfortunately, heuristic method have been failed.


help team !!!!