Hi,
I have tried to upgrade firmware on my Mk902II with the latest avaliable firmware (MK902II Android 5.1 FW_170808) avaliable here: http://www.rikomagic.com/en/download/do_3.html
Upgrading went smooth with no problems, but the divace fails to boot, shows an error message: "Recovery System v5.0 E:failed to mount /metadata /dev/block/platform/ff0f0000.rskdmmc/by-name/metadata (Invalid argument)"
I downgraded the firmware to MK902II FW_161021 and this one works fine.
The conclusion is that MK902II Android 5.1 FW_170808 do not work.
Does anyone know how to make it working?