Hello.
In the end, I was able to complete the necessary things and connect the stove to the internet.
-MR3020 v3.2 (stimulant) bought on all..ro locally, as it turned out from a friend from this topic, who was one of the pioneers
-EcoLink (USB-> RS485 converter) bought on alie ... es for PLN 20 RJ telephone cable

On the tp link I put "LEDE 19 with GUI" and then "eco-mr3020-v3-3.2.3678-em-fda69db834b649919bfeeecd8d955327.bin". The clone started up and connected to the router, first with a cable and then via the www via wifi. I connected it to the furnace controller and it generated a UID, thanks to which it was possible to register on econet24.
The android app works as normal, but it's truncated and only has a preview some basic settings

and on econet24 I have the message "Blocked device"

I do not know if I did the right thing to upload soft from
@kashue and not "root_eco.bin" from @przemo_ns. And the second thing is that I updated the econet (mr3020) after connecting to the network when I popped up with information about the availability of a newer version.
Maybe I should upload a dedicated soft for it? I don't know, any suggestions?
Anyway, weird, the econet app works and the website is blocking.
Thanks a lot to @ SławekSS for help.