When I try to check the box to activate wifi ,after 1-2 sec. the box automaticly is uncheckd.I can`t conect anymore the wifi module.Whats the problem? I put an official firmware version an also the 5.0 one and the problem is the same.Yesterday was working the wifi, but today it not start.I pull out also the baterry but without any result.Please tell me what is the problem? (excus emy english)