After flashing the phone from android 6 (pre 20160822) to 7 (20170708), the phone became stupidly slow, opening facebook or viber takes about 20-30 seconds, other apps got slow as well. Can this be solved by downgrading to earlier ROM, or should I just go back to 6.0?
4G does not work either, never did actualy, I was hoping that an update will solve this matter, but it did not
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