Good News, Cubot has released the stock firmware for it’s hot selling item GT99
Download link: CUBOT GT99 Firmware
the same flash method and Flash tool as CUBOT A890:
Pls note, before you flash the phone you need to install the drivers on your pc.
1:Open flash tool “SP_MDT_exe_v3.1304.00_A2013.02.26_customer”
2: Choose the right file as the shows(in the file which you download)
3: Change the USB port to “Preloader →DA”, Click “start all”
4: Connect GT99 with your pc using the cable
5:The only thing you can do is waiting now. It should take 3-5mins. It will show 100% at last.
Note: make sure you have install the driver of mtk6589 phone on your pc before you flash it.