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Help bugged sam galaxy tab 3 8.0 (sm-t311)

hi, can anybody help me with my tab :(
the problem is, there’s too many ad popups, auto installing apps, auto downloading apps, charging too slow and battery so quick to drain. i have installed mobile securiy but it’s already bugged up when install one. the mobile security sometimes say that my tab is i fected with trojan. then i decided to try the factory reset and hard factory reset and even rooted it but it still same is happening. i’ve been searching instruction on how to kind of reformat and clean install my android OS but its hard to find a clear stepto follow.
thank you in advance fellow forumers.
 

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