zu680kl unlock failed : Unlock Device App 9.1.0.7 Network error

Please tell us some basic information before asking for help:
- Model Name:zu680kl
- Firmware Version:ww_14.1010.18040.75_20180612
- Rooted or not:no
- Frequency of Occurrence:always
- APP Name & APP Version (If your issue relates to the app):Unlock Device App
Hi everyone,
my zenfone3 ultra is old enough,and I want to root it.
I can't unlock the bootloader because when I use the app an unknown error appears probably due to the network.
"unknown network error,
please wait and try later"
I used VPS in NewYork ,but the same error occured.
Unlock Device App app is download from the official Asus website.
some solutions i found on google says maybe your server is down.
Could you help me?
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Hi supermingxing
Thank you for your asking. Due to further processes involving personal information(SN), please check your inbox and reply to the PM.