However, the CDC Ethernet device only gets detected for a second when running usb_modeswitch with huawei-new-mode: it does detect "eth1", but then gets unregistered immediately and switches back to CD-ROM mode (usb-storage), which I don't want

What happens if you don't do anything (don't add ...

E3372-320, E8372-320 and other newer modems with firmware version 10.x.x.x try to automatically detect PC operating system (Linux/macOS or Windows) and switch the mode accordingly. This is done by detecting USB Get Max LUN request from the operating system to device's CD-ROM.

Automatic switching ...

E3372-320, E8372-320 and other newer modems with firmware version 10.x.x.x try to automatically detect PC operating system (Linux/macOS or Windows) and switch the mode accordingly. This is done by detecting USB Get Max LUN request from the operating system to device's CD-ROM.

Automatic switching ...

immediately changes to 12d1:14db, even though I disabled usb_modeswitch in its conf file ('DisableSwitching=1' in /etc/usb_modeswitch.conf).


Do you have a modem of a newer modification, like E8372h-320 or -820 with firmware 10.x.x.x?
E3372-320, E8372-320 and other newer modems with firmware ...