Change software on chip?

Is there a way for me to have a look into the memory/filesystem or even change files to add functionality or fix bugs?
Or do you have a beta version of the software with new features, I can test?

I tried to use port forwarding to connect to the http user interface with a port other than 80 and it doesnt work. There are websocket-calls using port 80 hard coded.
If this websocket-call was programmed correctly, it use the port number of the request. I know there is a cloud service also.