How to force stop/block/blacklist UC News and 9apps from installing in my android phone for whole life
One way to avoid all such issues is by rooting your phone.
That gives you plenty of control on it (it becomes essentially a Linux box), and you can install one of many possible flavors of Operating System (custom ROM).

Judging from this Google search, rooting your model is something already worked out.

Nevertheless, you have to be careful, since it may "brick" your phone, i.e., make it useless. For many phones, there are very detailed instructions available on how to do that.

PS1: A few links in this Google search (e.g.) report users which did not get rid of auto-installed apps, even after rooting. Whatever these users did, it has to be taken with a grain of salt, though.

PS2: UC Browser has been under some criticism for its lack of privacy/security and invasivity.