How to use Huawei E5372 modem

Has anyone managed to use the Huawei E5372 4g modem with the GL-AR750S-Ext?
I tried using the USB mode, but without success. the AT commands work only when the sim is not present inside the modem

Here is a guide for your reference. https://docs.gl-inet.com/en/3/setup/slate/internet/#3-usb-3g4g-modem