The dual-core Jiayu G2 is a relatively new phone, and I'm unable to locate a prebaked firmware with root. Fortunately, there is a easy rooting solution that can be done! This guide is very similar to the one for the Acer Gallant Duo, the flashing program is the same but the files required are different. If you have already installed the drivers for another Mediatek device you won't need to do it again.
1: Download this file and extract it: http://ge.tt/api/1/f...0/blob?download
2: Copy ' G2S_MTK6577_1GB_Root.zip' to your SD Card
3: Turn off your phone and remove the battery
4: Reinsert the battery and THEN connect it via USB. Open up device manager on your PC, find the new 'Unknown device' and point it to the directory where you extracted the files from
5: Load up 'Flash_tool.exe'. Set 'MT6577_Android_scatter_emmc.txt' as the Scatter loading file. Double click on 'Recovery' (7th in the list) and select 'G2S_MT6577_1G_recovery.img'.
6: Click Download. Wait for a green circle to show up. Your phone now has a flash new Recovery ROM!
7: Disconnect the cable. Turn on the phone by holding Power and Volume + simultaneously.
8: You're in the recovery menu. Select 'install zip from sdcard' then 'choose zip from sdcard' and select the file 'G2S_MTK6577_1GB_Root.zip'.
Congratulations, your phone is now rooted and ready to go! If your phone plays up run a factory reset and it should fix it. Now that you have Recovery running on your G2 it might be worthwhile to make a backup.