Download THL W200S Android 4.4 Kitkat firmware
Archive name: deodexed_W200S-4.4.zip
Archive file size: 375 MB
Build number: android-user 4.4.2 KOT49H eng.ywj.1404466170 test-keys
Version number: ThL.W200C.156F.A1.KK.HD.EN.8P64.GC2235.MT6592MW.GST.20140702
Install notes
Copy .zip file on SD card.
Reboot in recovery and flash it.
Reboot and wait about 2 minutes to run.
After flasing all you data will be wiped.
No front camera, after flash in Recovery don't push install superuser.
MTK 6592 only tested on 156D version
Warning: after flash, before phone screen turn off, go in Settings /Accessibility/Smart wake and turn this option off.