Download latest KitKat stock firmware for Rikomagic MK802IV TV Stick (AP6210 version) from here or from here. (S/N start from 201307**** till now).
Archive: MK802IV_AP6210_141208
Firmware image file name: IV_AP6210_20141208_V4.4.img
Platform: Rockchip RK3188
Archive size: 303 MB
Archive: MK802IV_AP6210_141208
Firmware image file name: IV_AP6210_20141208_V4.4.img
Platform: Rockchip RK3188
Archive size: 303 MB
Boot version: 2.19
Firmware version: 4.4.02
Firmware version: 4.4.02
A list with 16 firmwares for Rikomagic RKM MK802IV with RTL8188 Wireless/BT chip you'll find here.