How to check your phone is B version or not?
remove the battery, if you see a "B" (as the picture shows), then it is B version.
Flashtool : SP_Flash_Tool_v3.1312.0.139.rar
ROM: B version zopo c2 130422.zip
1. Install the driver. After connecting C2 with PC, the PC will detect new device, just follow the wizard to install it.
2. Unzip flash tool, click the following icon to run it.
5. Quickly plug the usb cable to the PC and connect C2 with another interface(the phone is powered off when update, but don't need to remove the battery)
6.It will finish the update itself. when you see the green circle, unplug the phone. done.