Hi I have a huawei g300 which now won't let me connect to wifi all it specifies is error with both wifi and Bluetooth running android 2.3.6 how can I fix this I don't have no SIM card this aswell and also I need an urgent fix because I would like to reuse this phone as we'll and if possible as we'll how do I update my phone because I got no sim in this anymore can I update over wifi?