ok a lot of corona boards will not display xell. This is a lot of the reason I have never wanted to mess with a corona (about to start fighting this MW3 box a friend is paying me to do) but depending on version I may be able to help you out with a special ecc that will allow you to see xell. I know corona v1 and v2 you can do it. The issue is I noticed you bought it so I take it you have no programmer cable running out of the side of the box and you probably didnt think to purchase a programmer so I am not sure how you could flash a new ecc.
JQe360 is the site where your covers come from as well as the guy that hosts Link on his servers. Is that what you mean by seeing people but not being able to log in? If this is the case open up dashlaunch and ensure that devlink is turned off in the dashlaunch settings and save it.
If you dont mind tell me more about this 360 like the manufacturing date. This will give me a good idea of if I can even get xell to load on it.
has the same issue but he has a corona v4.
The reason I dont want a box without xell is because of not being able to launch anything compiled with libxenon (like the n64 emulator)