Nubia X MokeeOS not entirely working

What I have done already:
-Flashed TWRP on Nubia X
-Kind of Flashed MokeeOS custom ROM
-Flashed GApps
-Flashed SuperSU

I bought my Nubia X from CECT Shop in 2018 and it was already Flashed with GApps.
The OEM update function didn't work from the beginning.

I have NubiaUI v2.16 installed but for MokeeOS i would need at least v3.05.
Anyone can help me here?
It seeems to me that the original packages released by nubia are just to update but not to install completely new.