Can not use flash charge, the main reason is that you did not agree with his fast charge agreement, he generally when you activate the phone, it will pop up those comply with this agreement, that agreement you did not check, so he can only charge according to the ordinary mode, if you want to have flash charge, you then reset, that is, the kind of check charge, that is, open his charging agreement directly check agree, He'll be able to flash.
If you originally support flash charging, suddenly do not flash charging, you see if it is the charging tail plug interface? In addition to dirty things that lead to poor interfaces, or oxidative wear on the charger