Does not own English therefore use translator.
I have Rb411r damaged on not incomprehensible reasons. Worked 2 weeks, fed on steady-state tension of 12v. Now RB on energising irresponsive, LED does not shine. Where to dig? 
contact the Seller for replacement
Not variant - a salesman renounces a return.
why?
Explains that no time is him to be engaged in returns. And local legislation instrumental in him herein.
ask money back, or contact local friends with baseball bats to help 
Да я бы с радостью 
Но мне бы лучше принципиальную схему роутера.
sorry but that information is not available.
I guessed about such answer. Expected the help of local skilled craftsmen.
Made repairs successfully and by the forces . A theme is closed.