my english is not so fine but i will give you my steps how it works.
My SticK: MK809III with AP6250
After many ROMs i testet and nothing works i hate my stick.
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I talk to them "If you brick now i will buy another newer stick!"

And i start a new art of flashing.
I load two firmware:
MK809III - KitKat 4.4 - SMIC717394 ---- 1080p ROM
thank you SMIC717394
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and
NEW!! pureX KitKat V1 - New firmware for CX-921 and CX-919
thank you walter77
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I open both files an build my own firmware:
From SMIC717394 i got the kernal.
From walter 77 i got all other files included the parameter file 6GB.
Then i flash the stick with clearing the IDB.


Next step was short test of WLAN and Logitech G2.4 Keyboard 400.
Done

Then i start the camera on Kitekat.... and the picture was fine



So, if you test them... don`t brick.
Flashing is always your own risk!!!!!
Thank you to this forum.....
without your work we have all sticks without a good performace.
Edit: 30 minutes Skype with stable WLAN
Photos of my MK908III:
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