Need Some Help to E-Star Mini HD 7.85 Firmware

Someone can get me a ROM or firmware oficial or not but i apreciate the tools tool be cool if can get the oficial one I’m not sure what I need to be able to update my tablet and estar mini hd 7.85 with kit kat firmware 4.4 that blacked out things without wanting the official ROM to the root leaving it unstable so asked for help to someone here in the forum . thank you