(solved)How do I rebrand on 6.0 MM?

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Hi! Thanks in advance for your help.
I specifically bought a p9 eva-al10 to try 8.0 on it.
However it seems the system version is still stuck at b198 on MM.
I have done extensive searching but since this is a Chinese model all methods just don't apply.
I realized I could just rebrand to European model to get to nougat, then rebrand back to Chinese to get oreo. Unfortunately no methods I looked up were for marshmallow.
What can I do from here?
I managed to unlock bootloader, so maybe I could just force flash the European firmware?