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how to downgrade to oreo

Star I
Please tell us some basic information before asking for help:
Model Name: ze620kl
Firmware Version: ww_16.0615.2005.130
Rooted or not: not
Frequency of Occurrence: -
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
how to downgrade form pie to oreo because i find some problem with pie like camera whatsapp and instagram so dark but on pixel master good enough

Star II
Tell me how can I downgrade from android 9 to android 8.1
I have already downloaded the stock firmware from support website of android 8.1. please help me.

Star II
I have downloaded the stock firmware android 8.1. tell me how to downgrade it from android 9 to android 8.1