October 31, 2020 at 02:28AM : please help trying to read firmware 990

igmaKey 2.39.04 HiSi: Read firmware
HUAWEI USB COM 1.0 (COM377), Provider: HUAWEI Incorporated, Driver ver.: 2.0.6.725, Date: 05/11/2015, USB\VID_12D1&PID_3609&REV_0100
HiSilicon: Kirin 990
Sending boot...Error writing to serial port
--------- 2020-10-30 19:24:18 ---------
SigmaKey 2.39.04 HiSi: Enable downgrade
HUAWEI USB COM 1.0 (COM377), Provider: HUAWEI Incorporated, Driver ver.: 2.0.6.725, Date: 05/11/2015, USB\VID_12D1&PID_3609&REV_0100
HiSilicon: Kirin 990
Sending boot....Error writing to serial port

please help trying to read firmware 990 or enable downgrade same error very time

by pabloelmaestro via GSM-Forum