GL-MT300-V2 with Huawei E3531i-2

Good day to all,

I have a problem with the surfstick Huawei E3531i-2 in conjunction with the GL-MT300-V2.

I would like to create a wifi network with GL and the Internet should come via the surfstick. The stick is recognized, but it does not establish a connection. I have already read some in various topics but I do not get on (it must be said that I also have little idea of the stuff).
It says that I should change the IP of the GL, I did and then I should run the stick via Tehtering. This step is somehow not possible for me.

Does anyone have an idea there and could help me?

Best thanks

Translated with DeepL

Could you give a screenshot? I want to know Huawei E3531i-2 is modem or tethering mode.

You have changed MT300N-v2 LAN IP but it didn’t work, right?

Yes, I changed the IP from GL to because the Huawei stick is supposed to use 8.1 as well.

What screen do you want from the GL when I am connected and on the interface?

The Admin panel setting indicating the connection failure.
Please also run command to get log and modem status info by ssh

cat /sys/kernel/debug/usb/devices