Download latest 4.4.2 stock firmware for Rikomagic MK902II TV Boxs from here or here. Download previous firmware from here. Download Android 5.1.1 Final Lollipop firmware for Rikomagic MK902II TV Box from here.
Model: Rikomagic MK902II TV Box
Model number: RKM MK902II
Image file size: 398 MB
Platform: Rockchip RK3288 / RK32
Build number: RKM MK902II-eng 4.4.2 KOT49H eng.zz.20160511.155856 test-keys
FW version: 4.4.02
Boot version: 2.17
SDK version: RK30_ANDROID$(PLATFORM_VERSION)-SDK-v1.00.00 \
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.