How I can bond ADSL with 4g using my ISP's settings

Installing and Using OpenWrt Network and Wireless Configuration
1

My Greek ISP (Cosmote) offers a solution that bonds ADSL with 4g network in order to speed up my internet connection: https://help.cosmote.gr/en/article/PROD-11341/KW759-What-is-COSMOTE-Home-Speed-Booster-and-how-does-it-work

I want to be able to configure an OPENWRT router in order to achive this but I am unsure about the feasibility of this endeavour. Have you ever tried this?

Redarding the bonding what I found are these resources using my DuckDuckgo-fu skills:

ISP seem to provide some sort of bonding (I mean it offers it as an actual service and I pay for it) but I do not knwo how to config OpenWRT in order to support it.

Also I googled some specific protocols that could support it such as Multipath TCP: https://en.wikipedia.org/wiki/Multipath_TCP

And GRE tunnels: https://en.wikipedia.org/wiki/Generic_routing_encapsulation

My best bet is Cosmote using the latter.

2

Can you point to your provider saying you can LACP mobile with dsl?

3

What ISP says is: https://help.cosmote.gr/en/article/PROD-11341/KW759-What-is-COSMOTE-Home-Speed-Booster-and-how-does-it-work

4

Do you have the CPE to copy config from? You need to know the mptcp or gre endpoint in providers network.

mptcp needs at least 16/128 device, gre can work on any (supported) toaster.

5

It seem to provide an endpoint:

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Error is because my current router has hardware issue.

Idk though what protocol is

6

Seems a no-go https://forum.mikrotik.com/t/bonding-3g-stick/119529

their bonding is certainly NOT LACP or linux bonding that needs a bunch of identical ethernet cards.

Good starting points would be openmptcprouter documentations/discussions and ovh overthebox ones. DSL and USB modem will be both hard (read expensive) to intercept to capture and understand actual protocol used.