Download latest Android KitKat 4.4.2 stock firmware for MXIII Pro Android TV Box from here or from here.
BTW, you can now buy MXIII Pro TV Box from www.geekbuying.com for only $56.99 with free shipping.
Firmware details
Archive: MXIII PRO Amlogic S812 Android TV BOX Firmware 194121 151016
Image: S812_S819_DDR2G_WIFI6330_1000M_sdk0823_CX-S819-20150826.img
Archive: MXIII PRO Amlogic S812 Android TV BOX Firmware 194121 151016
Image: S812_S819_DDR2G_WIFI6330_1000M_sdk0823_CX-S819-20150826.img
Model: MXIII Pro Android TV Box
Image file size: 465 MB
Platform: Amlogic S812
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.
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