1. Optimized WiFi performance.
2. Fixed some MK802IV reboot issue.
3. Optimized WiFi Display function
Pay attention, this firmware is only for RKM MK802IV with Broadcom AP6210 Wireless/BT chip, it is not intented for RKM MK802IV with RTL8188 Wireless/BT chip (first generation). You can install it on this if you really want, it will work just fine, except WiFi and Bluetooth connections.
A list with 14 firmwares for Rikomagic RKM MK802IV with RTL8188 Wireless/BT chip you'll find here.