Download latest Android 7.1 stock firmware for RKM MK22 TV Box from here, here or here. Download latest Android 6.0 stock firmware for Rikomagic RKM MK22 TV Box from here. Download previous firmware from here.
Archive: MK22 Android 7.1_170420_demo
Model: Rikomagic RKM MK22 TV Box
Image file size: 790 MB
Platform: Amlogic S912
Image name: MK22 Android 7.1_170420.img
Other: this is a beta version, still some bugs
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.