Here is the Stock Firmware Download And Update Instruction special for Geekbuying itemcode: 313424
Upgrade instructions:
1. Open the Smart Phone Flash Tool. Below is the flash tool download link:
https://www.dropbox.com/s/ufsxsob74vn87s6/SP_Flash_Tool_v3.1220.01.rar or
http://www.mediafire.com/download/slxszvc8vastetc/SP_Flash_Tool_v3.1312.0.139.rar
2: Download the firmware, below is the download link, pass word: geekbuying.com
Download link 1: https://www.dropbox.com/s/ryo6lwvynhmtfk1/STAR%20G9300%2B.rar
Download link 2: http://www.mediafire.com/download/6dcg25l57b8rqhn/STAR_G9300%2B.rar
3: select Scatter-loading:
Click it to select the right file for Star G9300+.
Browser the firmware and double-click txt file named: MT6577_Android_scatter_emmc.txt
Here we go:
Click the “Upgrade” button.
4: Turn off your Star G9300+, and connect it to your pc with data USB cable
All set!! Just wait the progress bar reach to the end and “OK” jump out.