[HELP!]can anyone teach me to change GBread to KK 4.4 with my rooted phone

[Destro]

Please I need to Change my gingerbread os to Kitkat os because i cant download my favorite app CLASH OF CLANS oh btw can you suggest any lagfix without paying THANKS i wish you could help me

 

[SavageRobot]

Hello,
Need to know what phone you have to help.