http://www.jellydroid.com/2013/08/root-and-unroot-jiayu-g4-without-pc/
Αντιγράφω από εδώ
Before rooting, you must keep in mind that, it can void the warranty of the device.
Download the latest version of Framaroot and install the APK.
Now, Open Framaroot select the action to perform. Select “Install SuperSU”.
framarootsupersu
Thereafter, in the rooting menu, Select an exploit in list above to potentially root your device as BOROMIR and proceed further. The rooting has now started and you will be getting an awesome success message.
framarootboromir
When it i finished, just reboot your Jiayu G4.
Congratulations, your device is now rooted!
Αν το ακολουθήσεις κατα γράμμα, σίγουρα παίζει. Το δοκίμασα πριν 6 ημέρες σε G4 Thick.