ZenFone 4 Bug Report

Firmware/APP Version: 16.0620.1905.10
ZF Model: ZE554KL
Screenshot: https://us.v-cdn.net/6031231/uploads/ww_attachments/201912/15/234136aj6jjvo06p6bftf0.jpg
APP Name: Android System
Rooted: No
Frequency of Occurrence: Always

I updated my Zen4 to Android Pie, version 16.620.1905.10 but I want to downgrade to android 8.

I downloaded the software version to downgrade to WW 16.620.1905.10 to WW 15.0610.1905.28 but everytime I trie to downgrade de software following the steps https://www.asus.com/tw/support/FAQ/1039929 the system gives me the following errors " E: footer is wrong" "E: signature verification failed" "E: error: 21".
Anyone can help me ?


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