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how to downgrade android 9 to 8 ? please help

Please tell us some basic information before asking for help:
Model Name: Zenfone 5 (ze620kl)
Firmware Version: WW_V16.0615.2005.130
Rooted or not: no root
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.
Please help me. I have android 9 version WW. I want to return from Android 9 to 8, but there is no version downgrade file. How can I make? But zenfone site andorid is have the return file for 10 beta to 9 but file don't have 9 to 8 please someone help.


Rising Star I
Officially they didn’t release the downgrade file