I did a quick search to find exactly what your device is, and it looks like it leads a dual life. The Geniatech products are also sold under the MyGica brand name. You just have to look at the quad-core media boxes from Geniatech and MyGica to see that they're identical.
I can't give you any direct advice, but I'd suggest that you find the exact model number of your device, then search for "Geniatech <model> android 4" and "MyGica <model> android 4" (replacing <model> as appropriate). There's bound to be someone else out there who's done it. The XDA forums are also a good place to look. Try searching for just "Geniatech" and "MyGica" and see how many threads come back.