You cannot install MIUI 9 themes file (.mtz) directly on MIUI 8 running devices, if you don’t have MIUI designer account. It requires few extra steps. In the below guide we let you know how install all new MIUI 9 themes, such as Limitless, Color fantasy and Cool black on any MIUI 8 devices without any error massage.

You can install MIUI 9 themes on devices like Redmi Note 4, Redmi 4, Mi 5, Mi 6, etc. and bring a unique look to it. All you need to download the theme file (.mtz file) and follow the below step by step guide. To install MIUI 9 like third-party themes on Xiaomi devices, it requires app like MIUI Theme Editor. The app helps you install MIUI themes without any error. MIUI 9 Theme Downloads: – Color Fantasy – Cool Black – Limitless

How to Install MIUI 9 Themes on MIUI 8

  1. Go to Play store [HERE] and install the MIUI Theme Editor app.
  2. Run the Theme Editor app and tap ‘Browse’ button.
  3. Navigate the MIUI theme file (.mtz file) you have saved on your phone storage.
  4. In the next screen, you will see the edit options. Just skip this option and tap next.
  5. Tap on the ‘Finish’ button (it will take some time to complete).
  6. Once the process is done, you will see an option ‘do you want to install the theme’? Just tap on ‘OK’ button. Now, open Theme Manager App on your phone, browse the theme you just saved and apply it. (Source – XDA)