1. Download and install oneclickrecovery on your mobile phone. There are many websites and find them by yourself.
2. Download the ROM at http://www.get.cm/. this is cyanogenmod. You can download the latest ROM and select v9from the left-side devices. Put the downloaded. ZIP file in the SD card of your mobile phone.
3. Run oneclickrecovery on your mobile phone to enter the recovery mode.
4. There are two options starting with "wipe" in the menu. One is "wipedata" and the other is "Wipe cache". Click "yes" to delete the data.
5. Select install from SD card in the menu and select the ROM package that you just placed on your mobile phone to start installation.
6. After installation, select reboot and restart the system. Note that it takes a long time to start the instance for the first time. Please wait patiently.
7. After the instance is started, the English interface is displayed by default. You can change it to Chinese (simplified) in settings-> Language & keyboard-> Select language ).
Now you can experience the new system.