To those willing to downgrade from android 10 to 9 because you are just tired of asus playing jokes on us, you are at the right post!
so to downgrade from current buggy android 10, you must backup your data because if you downgrade all your data will be lost, so be aware of this.
now that you have backed up your data, you must go to this link
For Global users (WW):
https://dlcdnets.asus.com/pub/ASUS/ZenFone/ZS660KL/UL-ASUS_I001_1-ASUS-18.0631.2001.64-1.1.92-user.z...For China/Tencent ROM users (CN):
https://dlcdnets.asus.com/pub/ASUS/ZenFone/ZS660KL/UL-ASUS_I001_1-CN-18.0631.1910.63-1.1.252-user.zi...After downloading the zip, you must move your zipfile to the root of your storage device which means it should not be inside any folder. After that just restart your device and after restart it will detect update. click on the notification and it will start this update, after update click reboot and let it finish the update, it will take sometime to boot up on logo since you just downloaded new firmware. After this you device will be on android 9 and you will need to setup your device again.
Hopefully this helped!
