I have qmobile 4.4.3 kitkat.my device is infected with virus so as its lagging performance.somes times apps are crashing and sometimes contacts are missing. It feels that some backgroung app is running.i have twice installed firm ware but after short span of time problem continues to exist.Google play service and some other bloatwares are not working properly in the sense that when i disable google play services its total data reduces to zero after uninstalling updates but manage data option does not vanish and apps memory begin to rise after a little bit time without updating.similarly ringtone bell on audio profiles overrides on notification ringtone whether i have selected a different notification bell.

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