Ls: /dev/cdc-wdm0: No such file or directory - What am i missing?

Hi.
I have 4 x usb 4g modems connected to my rasp pi 4. I want to bundle and loadbalance the 4 modems to 1 internet connection. I have succeded in installing everything using the luci-proto-3g package but the /dev/ttyUSB* keeps changing and every modem creates 4 ttyUSB devices.

So i checked out the " How to use LTE modem in QMI mode for WAN connection" post and i get stuck where i have to get a response when typing "ls -l /dev/cdc-wdm0".
I should get "crw-r--r-- 1 root root 180, 176 Oct 1 12:03 /dev/cdc-wdm0", but i get "ls: /dev/cdc-wdm0: No such file or directory" and i dont understand why. I have followed the above mentioned guide and installed the dependencies but it wont work.

Any suggestions?

root@OpenWrt:~# lsusb
Bus 001 Device 007: ID 05c6:6000 Qualcomm, Incorporated Qualcomm CDMA Technologies MSM
Bus 002 Device 001: ID 1d6b:0003 Linux 5.4.128 xhci-hcd xHCI Host Controller
Bus 001 Device 008: ID 05c6:6000 Qualcomm, Incorporated Qualcomm CDMA Technologies MSM
Bus 001 Device 009: ID 05c6:6000 Qualcomm, Incorporated Qualcomm CDMA Technologies MSM
Bus 001 Device 005: ID 1a40:0101 USB 2.0 Hub
Bus 001 Device 003: ID 062a:07c8 AliTV Remote V1 RF USB Controller
Bus 001 Device 006: ID 05c6:6000 Qualcomm, Incorporated Qualcomm CDMA Technologies MSM
Bus 001 Device 004: ID 1a40:0201 USB 2.0 Hub [MTT]
Bus 001 Device 002: ID 2109:3431 USB2.0 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux 5.4.128 xhci-hcd xHCI Host Controller