@MrIsh
I'm not sure what this "known issue" is. From what I'm reading, the network password was incorrect. Maybe I'm missing something in what you wrote, but if that was the problem, Roku can't make you enter it correctly. That's not something they can fix. Again, maybe I'm overlooking something in what you wrote, and I'm not understanding what you say the issue was, if not an incorrect password.
As for the reset button, you have to press and hold for no less than 30 seconds if you want to do a full factory reset. That is the sure way to factory reset. Many will hold it down until the screen goes black or some other action on screen. The proper full reset method is a full 30 seconds, regardless of what's onscreen.
As for how to check the settings on your router, I don't know what router you have. But rather than tell me and me enter that in a search engine, you could do that yourself a lot quicker. Usually, there is a local link that's either written on the router, or in the documentation that came with it. Either way, you access it via a Web browser, you would enter the admin id (often 'admin') and password. Then, via an interface, you could check, and if necessary, change the settings.
These exact steps vary from brand to brand and even model to model within brands. So, there's no one answer. However, searching for your router's model number online should return some results that include how to access the admin interface.
If you were able to connect with proper network credentials, then it seems as if the b/g/n changed to g/n was not the issue anyway. However, it's sometimes a good thing to know how to do, if network issues arise (not limiting discussion to Roku for this).
DBDukes
Roku Community Streaming Expert
Note: I am not a Roku employee.
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