I don‘t think there is any issue with the box- in my view the ET8500 was one of the best boxes ever - I had two and beat them to death, including power drops!
The issue is the inabIlity to get a network connection and by the way system reset getS you no where - so don‘t do it.... and stop messing around with files from the internet.
1) Menu/setup/ViX/Imagemanager
2) yellow button download latest ViX image
3) select downloaded image - blue button flash
4) do not restore settings or plugins
5) just follow the wizard setup accepting the basics e.g language, 1080 and whatever the network wizard decides
6) setup tuner by letting find your setup.
7) let it scan transponders
8) check you can access BBC1 - up button, select satellites (green button) and find BBC1
9) LAST ! Menu/Information/network ... what does it say??