Re: AC1200 iNTERFACE PROBLEMS
How do I unlock the router so it will interface with Google Chromecast?
I'm not sure what you're even asking here. What are you attempting to do with the chromecast so you need to "unlock the router"? And what do you mean by "unlock it". More information on what you're attempting helps.
what router are you using? AC1200 isn't a model number. Firmware on it?