Thank you for your replies. I have contacted the company and they said that it's probably a hardware problem caused by the high humidity we've been having here in Hong Kong lately. It probably has nothing to do with the upgrade at all. Will send back this new device and see if they will fix it or come up with another new one. Also, it doesn't seem like the battery lasts that long. I left the EBook on locked position for a few hours and a good portion of the battery was gone. It seems that the battery would have been totally gone if I left it on for the whole day. Not sure why this is the case, hopefully the battery isn't problematic also! haha