Deodexing

I've no idea how should I deodex my C5 Ultra. Some tools here at XDA requires odexed ROM to deodex. I have no idea how to find a prepared deodexed ROM or stock ROM's ".zip" file. Long story short I can't reach to ".zip" of stock ROM and there is no ROMs and I want to deodex. What can I do? Go easy on me I root but I don't develop so I feel like a noob here at XDA.

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