Download latest Android 4.2.2 Jelly Bean stock firmware for Jiayu G4 smartphone from here or here. Download another Jiayu firmware from here.
Archive file size: 321 MB
Support: Mediatek MT6589
- Unpack FlashTools, and Click on Flash_tool.exe
- Select a the MT6589_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- "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.