Re:stock or custom ROM sources for Samsung Cone smartphone...request

I recently bought a Samsung clone smartphone online , and would like to "upgrade" this smartphones stock rom;
this Samsung clone phone has the following specs : Model #GT028,MTK cpu-MT6589,Samsung clone model,number-??,Android stock ROM version--4.2.2 Kit Kat (I am having issues running Kit Kat on this Samsung
clone smartphone that should have been oem upgraded to Android Lollipop or Marshmallow,hence my post...)

If anyone can point me in the proper direction to locate & download a stock...

Re:stock or custom ROM sources for Samsung Cone smartphone...request

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