ROM download link: http://www.needrom.com/download/thl-t12/

Version: ROM Android 4.4.2

ONLY MT6592 + 1G RAM + 8G ROM + HD

Update Official ROM ThL T12 version: thl.T12.171A.1373GWM.V02.A1.150312.KK1.V2_10.HD.MV 88.B1B5 – KOT49H – V1_WCDMA

Official ROM ThL T12 version: thl.T12.171A.1373GWM.V02.A1.150202.KK1.V2_10.HD.MV 88.B1B5 – KOT49H – V1_WCDMA

Gapps include – No Rooted

Language support:Multilanguages

Tutorial

Unpack FlashTools, and Click on Flash_tool.exe
Select a the MT6592_Android_scatter.txt in ROM
Wait file to be added into Flash Tool>choose Option->USB Model,click USB Model>Choose Option->DA DownLoad All>Speed>High Speed,click High Speed
Turn off your phone, remove the battery>Press F9 (hit Download button) OR if upgrade ROM Firmware>Upgrade and connect your phone into the computer via USB data cable.
The process will start and a red progress bar will appear after color purple,yellow.
And green circles display
Finish
You can now safely disconnect your phone and turn it on.