unable to repair huawei security

SigmaKey v.2.33.04 build 02
975665884 Sigma dongle 2.33, Initializing...OK
Pack 1: Activated
Pack 2: Activated
Pack 3: Activated
--------- 2019-08-05 02:48:54 ---------
SigmaKey 2.33.04b2 MTK: Repair IMEI (Huawei DUA-###)
Removing firmware protection...Failed
--------- 2019-08-05 03:05:19 ---------
SigmaKey 2.33.04b2 MTK: Repair IMEI (Huawei DUA-###)
Removing firmware protection...Failed