Not charging, no flashing light

My device is not the first Wonderboom but the second, Wonderboom 2, could not find it as an device on here. When I try to turn it on it flashes red and makes the power down sound. When I connect it to charge nothing happens, no lights turning on, nothing. I’ve tried resetting it by holding down all the buttons but that did not work.

I have contacted the support multiple times but I’m not even getting an answer from them even though I am covered by the warranty.

So I would like to fix it myself instead. Anyone know how?