Faq. 1. Do you know what is it Cyanogen Mod 12 or CM12? 2. Do you know what is it bootloader, custom recovery, wipe? 3. Do you know how to boot your phone to bootloader/fastboot mode or recovery? 4. Do you have Android Lollipop on your phone? 5. Do you have section "Theme manager/Themes" in settings or "Theme manager" app in app drawer?