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Where can I find the Downgrade firmware for my device

Star I
Please tell us some basic information before asking for help:
Model Name: ASUS_X00LD
Firmware Version: WW.15.0400.1910.518_20191021
Rooted or not: Not Rooted
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.
I want to downgrade my Asus device which is currently on Oreo to Nougat.
I tried to use the "" from the official site, thinking I can do it by applying update from SD Card but that's not the case. It gave me error; Error in sideload/ (status 4)
Any help regarding the same will be appreciated.

Community Legend I
this concerns Zenfone 4 or am I wrong?