Hello everyboy (I'm french you'll excuse my ortograph..) I just had the same problem as everybody here. My headphones didn't want to turn "ON" (even when battery fuly charged overnight) and when it was charging mode, the color appears blue and red in the same time. This problem appened to me just after tryin to uptade de processus with the app' phone i just downloaded from official plantronics backbeat FIT. So I tri every thing poeple are telling here with no succes. And then, i had the idea to delete the app from my phone, re-download it and try to connect my headphone to my phone. To do that I just puch on the power button until it the red and blue light appears (keeping the power button press in te same time) and suddently my phone app asked my if i want to connect my headphone ! My headphone work again and the app was normaly uptade ! Maybe you kan try it ? It worked with me..