How to stop auto-install of random apps in phone?

Hello readers,

I had ordered a Lenovo Golden Warrior A8 (from ebay) , and from the moment I started using it, some completely random apps were installed. I uninstalled them and deleted their apk files, believing that this could prevent the system from installing them again.

From then until now, this whole thing hasn t stopped and random apps are installed all the time, sometimes even without my permission. The most common apsp I encounter is "UC mini browser" and "360 security".

I searched the web for a solution, only thing I found is "you must root your phone" or "do a factory reset". I tried the second one but nothing.

Any ideas?

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