For Huawei phones updated to Harmony OS are not detected by Device Manager as For "Huawei USB COM 1.0 serial port" after test pointing.
In such cases, Harmony TP cable will help you. If you connect the phone to the PC using this cable, it will be detected as For "Huawei USB COM 1.0 serial port".
Important:
Always connect this cable to the phone first.
Always disconnect it from the PC first.