Help downgrade my Nubia UI - Upgrading, Modifying and Unlocking

Hello devs! I want to ask you how I can downgrade Nubia UI 7 to UI 4.
I have installed UI 7 and used it for what's new in it.
But when I noticed that there's everything Chinese and no Google's apps, I decided to take it back to UI 4. Please everyone, I need your help! Help me get back my phone to UI 4 like it was yesterday.
Send me links, tutorials... everything what could help me with this. I really hope that it is possible!
My parameters:
ZTE Nubia Z17mini
4+64 GB
Octacore processor
Android 6.0.1
Previous Nubia UI: 4.0
Now its Nubia UI 7.0
Maybe I could send you more information but I really need your help.
Thanks a lot!
Greetings from Slovakia
-Tom

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