Help downloadprovider issue


after rooting, i accidentally deleted download manager (download provider)

so as instructed, i downloaded both downloadprovider and downloadproviderUI and put them in sys/app directory with setting the given permission and restarted.

my main issue is if i go under setting, storage, and click downloads, it used to open from "download manager" but nothing happens now.
so i went back to sys/app dir and tried installing both of the apk files but it failed to install ("app not installed") even though i have set the root explorer to r/w mode

anyone can help me on this?