You need a Windows installation (can be a VM with the USB shared to the VM).
You also need adb installed.
- Download https://github.com/jtanx/LinkZoneRoot/releases/tag/v1.0.0
- Execute the file as an administrator
- Select the drive letter for the modem USB
- You now have ADB access using: adb shell
ARM binaries:
- https://github.com/therealsaumil/static-arm-bins
- https://github.com/devanjith/dropbear-arm-android-binaries
- https://github.com/Miraje/dropbear
Launch scripts at startup, use /etc/rcX.d