Android Version: 4.2.2 beta
Release Android 4.2.2 Beta Upgrade for the MK808B Model, tested by Geekbuying on their MK808B Models.
Thanks for this.
Please notice, this just work for the Original Mk808b with Rk903 wifi Chipset !!
You can flash it with RKBatchTool you find here: http://vondroid.com/forums/rockchip.257/
And here is the Screenshot after you make the Upgrade
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MK808B - Official Firmware 4.2.2-20-03-2013
MK808B get Android 4.2.2 BETA upgrade