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First make sure the system is able to recognize Huawei USB stick. Open the terminal and type "lsusb". The response should look like:

[adminis@oc5108126737 Desktop]$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 003: ID 0a5c:217f Broadcom Corp. Bluetooth Controller
Bus 001 Device 004: ID 04f2:b221 Chicony Electronics Co., Ltd integrated camera
Bus 002 Device 003: ID 17ef:1003 Lenovo Integrated Smart Card Reader
Bus 002 Device 006: ID 12d1:14fe Huawei Technologies Co., Ltd.

As the device opens the storage first we need to use usb_modeswitch and device rules to make modem available. Create or edit /etc/udev/rules.d/50-huawei.rules file and add following line:

ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="14fe", RUN+="usb_modeswitch '%b/%k'"

Create the /etc/usb_modeswitch.d/12d1:14fe file and edit:

# Huawei E352
DefaultVendor= 0x12d1
DefaultProduct=0x14fe
TargetVendor=  0x12d1
TargetProductList="1506"
MessageContent="55534243123456780000000000000011062000000100000000000000000000"
CheckSuccess=20

Now re-insert the USB stick, wait few seconds and check the "lsusb" output for the Huawei modem

[adminis@oc5108126737 Desktop]$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 003: ID 0a5c:217f Broadcom Corp. Bluetooth Controller
Bus 001 Device 004: ID 04f2:b221 Chicony Electronics Co., Ltd integrated camera
Bus 002 Device 003: ID 17ef:1003 Lenovo Integrated Smart Card Reader
Bus 002 Device 006: ID 12d1:1506 Huawei Technologies Co., Ltd. E398 LTE/UMTS/GSM Modem/Networkcard

The device should be now correctly recognized by Gnome Network Manager and you can configure connection.