He he… I know it will sound childish but I am not good with phones.
About updating - phone offered me to upgrade and so I did it (because at that moment I was pissed of, because my download manager crashed and keep downloading smthg and somewhere… network data usage increased )
About clearing data - if it means - security - cleaner - then yes…
About old OS - like I said before - I’m kinda dumb with phones… I guess it was something from 5… smthng and I didnt try to downgrade because I was afraid download manager problem will be back… and with that my batery life will be down too…
Sorry for my lack of knowledge in phones… but I really hope for some good advice insolving my problem. I really hope in your power and wisdom! :)