Please tell us some basic information before asking for help:
Model Name: Zenfone 5 ZE620KL
Firmware Version: WW_15_0610_1801_42
Rooted or not: NOT
Frequency of Occurrence: Always
APP Name & APP Version (If your issue relates to the app): Unlock Device App
The program does not unlock the bootloader, writes (An unknown error occurs, which may be a network connection issue. please wait and try again later)