I updated the range extender RE305 using the Tether app. Once completed, it didn't start again. When I plug it in, all four lights go blue for a second, then the signal light goes red for a second, ending up with only the power light being blue and all other lights out. 
I've tried to reset button several times, even holding it for 20 seconds, but nothing changes. 
How do I make it work again?