now sigmakey cant unlock huawei y5 lite cro-l03,

SigmaKey v.2.32.01
Sigma dongle 2.32, Initializing...OK
Pack 1: Activated
Pack 2: Activated
Pack 3: Activated
--------- 2019-05-25 14:22:53 ---------
SigmaKey 2.32.01 MTK: Direct unlock
MediaTek USB VCOM (Android) (COM65), Provider: MediaTek Inc., Driver ver.: 3.2.0.0, Date: 1/21/2016, USB\VID_0E8D&PID_2007&REV_????
Baseband Processor: MT6735, E00
Version: OT6737M_65_M0_HW
Firmware: MOLY.LR9.W1444.MD.LWTG.MP.V94.P43
IMEI: 862555039780408
Phone model: Cairo-L03C45B120_62113_171228_SIGN
Performing heuristic analysis (stage 381 of 381)...Not found
--------- 2019-05-25 14:31:10 ---------
SigmaKey 2.32.01 MTK: Get unlock codes
MediaTek USB VCOM (Android) (COM65), Provider: MediaTek Inc., Driver ver.: 3.2.0.0, Date: 1/21/2016, USB\VID_0E8D&PID_2007&REV_????
Connecting....Failed


now sigmakey cant unlock huawei y5 lite cro-l03,why one year ago can unlock but now cant?