To clear up the confusion over which firmware you should install on your MK802IV. Rikomagic have issued the following information:
MK802IV with AP6210 Chipset (S/N start from July) should download the firmware 130719:http://www.sendspace.com/pro/dl/z80zb4
MK802IV with RTL8188 Chipset (S/N start from May to June) should download the firmware 130620 : http://www.sendspace.com/pro/dl/zzyqiz
Please note flashing the wrong firmware to the wrong device will either cause Wifi not to work or worse it may not work at all, so please check.
Support will of course be continuing for all versions of the MK802IV.