I was able to downgrade the firmware to version 1.0.48.
In the rooting step, as much as I paste the url into the browser and receive the given "{"code":0}", nothing happens, including the URL that should restart the router, not restart the router.
Can anyone help me get telnet access to the router so I can install OpenWRT on it?
The problem was that we cannot configure the router to perform the rooting step. only acceptable configuration is dhcp, which maintains IP 192.168.31.1, any other configuration should not work.
I restored the factory settings and did the Getting stok step, since it is mandatory, but I followed a youtube video of a German who is easier to understand.