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how to ze554kl Downgrade from Oreo 8.0 to Nougat 7.1 ?

Star II
Please tell us some basic information before asking for help:
Model Name:
Firmware Version:
Rooted or 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.


Star II
The firmware downloaded from asus site does not appears to perform the dowgrade ! ww_15.0405.1803.99.zip downloaded at root directory even after reboot !
Cel version : Asus_z01kd ( ze554kl )
Not rooted
actual firmware : Oreo8.0 ww_ze554kl_15.0610.1909.39
Problem : block screen always blinking even blocked / disabled draining the batery !
Thanks for any reply or instruction to solve this !