How to hard reset Xtouch X709 tablet as pressing of Volume down/up button + Power button combination does not work? The device is locked and can be unlocked by using Google accoun, but the wifi is off and I don't know how to turn it on. This device is without SIM card as it does not has a phone call function. There is no port/place for any kind of SIM. If somebody knows how to unlock it, please tell me.