Huawei WebUI Flash - Error: signature verification NOT passed

[Fastunlocker]

13-06-2019 11:01:47 PM Starting to write device...
Validating file...
File to write: D:\Huawei E 3372 H\Huawei_WEBUI_17.100.06.00.03.dgtks
File version: INPUT
Looking for attached port...
Attached port found: COM4
Changing device to download mode...

USB Device REMOVAL
Type: @usb.inf,%usb\composite.devicedesc%;USB Composite Device
VidPid: VID_12D1&PID_1442
Instance id: 5&10ef021e&0&2

USB Device INSERTION
Type: @usb.inf,%usb\composite.devicedesc%;USB Composite Device
VidPid: VID_12D1&PID_1442
Instance id: 5&10ef021e&0&2
Device has signed firmware
The file has no signature
Error: signature verification NOT passed
13-06-2019 11:04:25 PM Writing device finished with ERROR

Flash file downloaded from DC Unlocker Support Area

[Valdemaras]

Means file you try to flash into your device is not meant for your device version. Please understand, you can not flash whatever file you find.