You need these tool:
1. Flash Tool: dropbox.com/s/f7gfyqtwyn5qkpa/ISO-8859-1__Flash tool.rar
2. Firmware Upgrade: mediafire.com/?ehiyzbdmlauo7i7
3. ROM MOD S317 by MAKIS V1.3
the best one so far)
mediafire.com/download.php?u3ehud5ttldijca
4. Recovery: mediafire.com/?bo12ktkrrn57314
5. Driver: 4shared.com/archive/pimdjzA8/MT6575_USB_VCOM_drivers.html
Follow these step by step:
Step 1: Copy zip file ROM MOD S317 ( downloaded link number 3) and 2 file Recovery (link number 4) into the SD card
Step 2: Turn off the phone, take the battery out, plug usb cable and install Driver for the device (link number 5)
Step 3: unplug usb cable, insert the battery (not turn on the device yet). Run Flash Tool
Click scatter-loading. Browse to the MT6575_Android_scatter.txt file locate in the Firmware update extracted folder (link number 2). Tick all 9 options. Click Firmware-Upgrade
Step 4: Hold volume + key and plug the cable until the process running, release the key. Wait around 5 minutes until the green circle appear mean success
Step 5: After turn on the device we notice the default language are Chinese.
Install file Mobileuncle.apk that you copied in step 1.
Run the application and choose FLASH RECOVERY FROM SD CARD > select Recovery.img
The device will be restarted automatically
Step 6: Press Volume + during the device turned on to enter Recovery and do the following:
+ Wipe data/factory reset
+ Wipe cache partition
+ install zip from sdcard
+ choose zip from sdcard
Browse to the zip fle that you copied on step 1. wait for 30 seconds
Finished. Enjoy!