Returning to Offiicial/Stock rom from Mokee 100 - NX611j

Returning to Offiicial/Stock rom from Mokee 100 - NX611j
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Hi, I have a problem when returning to Stock Rom on my NX611j- Nubia Z18 mini
everytime I try, stock camera never works.
I get a black screen on 2.45 and 2.49 rom versions.

Any pointers please? need help