cant unlock the bootloader

[glucoseguardian]

Model: ZE620KL
RAM: 4G
Firmware/APP Version: V16.0615.1905.102
Frequency of Occurrence: > 10
Rooted: No
APP Name: Unlock Device App: Unlock boot loader
Screenshot: https://us.v-cdn.net/6031231/uploads/ww_attachments/201906/29/144633bpgilg7imi7gtfm5.jpg

i can't seem to unlock bootloader using the official unlock device app. Heres what I've tried : - using unlock device (v9.1.0.7_180912) on latest ww firmware (v16.0615.1905.102). - using unlock device (v9.1.0.1.180130) on latest ww firmware (v16.0615.1905.102). i even downgraded my Zenfone 5 to Oreo (Version V15.0615.1803.60) and tried both app version, but the app still can't unlock the bootloader. It says i have network connection issue while i have a perfectly fine connection. Why does it seem like ASUS is completely blocked their phone from being rooted/modified?

[hyperev667]

hope asus solve this problem fast.