WAN backup line

No problem. We are clear now.

This is possible.

Here is a thread which covers this topic.

https://community.ipfire.org/t/2-wan-interface-2-internet-providers/2204

You basically need to create a dialup profile for your main adsl connection and another profile for your mobile 4G connection. Then the 4G profile is set as a backup on your maion adsl profile.

Wiki page about dial up profiles.
https://wiki.ipfire.org/configuration/system/dial

Here is the wiki page on Network Hardware Compatibility - 3G/4G section
https://wiki.ipfire.org/hardware/networking#3g4g-umtslte-modems

Here is the wiki page on setting up the 3G/4G profile.
https://wiki.ipfire.org/installation/red/mobile

If you have any further questions on this or have any difficulties then come back. I have never tried this myself but there are definitely other forum members who have worked on this and will be able to help you.

Good luck.

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