[Q] HELP! How to flash CM 12?

Hi folks i want flash CM12 on my D802 ,but now i m on leaked Lollipop ROM (for D802)

When i start flashing CM i get an error- Error executing update binary.-------something like that.

What should i do?? Do i need flash KK bootloader back? if so How?

My recovery is TWRP 2.8.5.0. Thanks

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