I had this problem for several days 'Network Access Denied' and tried all the fixers to no avail until I found a Wi-Fi update in my Notifications, applied this update and Wi-Fi scan could see many access points but still would not connect to my router. Pressed both the volume up and the power button at once until the Huawei or Android logo comes up, then choose 'WIPE CACHE PARTITION'. Powered back on and now its working. I am happy and the sun is shining. Hope this helps.