This time I manage to install Android Jelly Bean 4.2.2 beta firmware version on Rikomagic MK802IIIS. First, you have to download the firmware image from here or from here. Now you have to put the MK802IIIS in 'firmware update mode'. For that, you have to run Rockchip Batch Tool 1.6, prepare a thin metal stick, press the recover button by the stick according below method, connect the unit with computer through the USB OTG port, not the power port (Micro USB to USB cable), hold it for 3-5 seconds and then loose the stick. Then choose the proper firmware image extracted from the archive you've just downloaded then press 'Restore' button.
This procedure will cost 3 minutes so please wait patiently, during recovery/upgrade, don’t remove the USB cable. When the final prompt window appears, then means recovery is successful, pull out USB cable, then total process is finished.
First turn on the unit after recovery/update will cost more long time, and even occur some lag issue, it’s normal since internal applications file need to be decompressed and occupy RAM, after 5 minutes, then system running well. So don’t worry about that. If you get stuck, may consider to restart the device.
Everything seems to run just ok, but the wireless does not connect to my wifi network (WPA2). From my knowledge, The MK802IIIS uses a Realtek RTL8188eu WiFi chip, and I see that the module 8188eu.ko is present in system/lib/modules, but I cant figure out how to enable it. I hope that someone manages to find a simple solution for that, a fix or a workaround.
Always keep in mind that this is not a review, just a first sight of this firmware. You have to test it more for another details, to see if it satisfies your needs.