I just got the Zenithink C91 for my son for his birthday. So far, so good, but I cant seem to get it to charge. I have seen on here that this is an issue and should update my firmware, but it is brand new and it has the 4.0.3 version on it. Under my status it has the battery 'discharging' but I still have 20% left, right now. So, I wasnt sure if it says that all the time if not charging. I have a green light on and when I plug it in, nothing at all happens. Green light stays green and doesnt charge. Please help before the battery dies completly! thank you!!