please refer to the doc: https://openwrt.org/docs/guide-user/network/wan/wwan/usb-modeswitching
and this discussion (referenced in the doc): 3g/4g USB dongle not showing up
Here is the data file for 0408:ea25 : https://github.com/NetworkManager/usb_modeswitch-data/blob/master/usb_modeswitch.d/0408:ea25