Since its not upgraded to kitkat it wont be too hard to revert back. You need stock recovery flashed and one of the last jellybean stock roms (my suggestion is B132). If you dont have a link to download stock rom just search the web for huawei p6 B132 or whatever you would like to revert to. As for the recovery you can extract it from the stock rom file with this tool
Read the instructions and extract the recovery only nothing else is needed.
Connect the phone in fastboot mode with pc and flash the recovery with cmd. Tutorials on using adb&fastboot are easily found on internet. Before flashing it make sure you have a sdcard with dload folder on it containing update.app file from the stock rom. After flashing enter recovery and wait for it to finish. That would be about it. Ask anything that you dont find easy or understandable to do.
Sent from my SM-G850F