problem in unlock bootloader

edited September 2020 in ZenFone 4 Series
ZF Model: ZD553KL
Firmware/APP Version: ww-14.0400/1708.154.-20170824
Frequency of Occurrence: nil
Rooted: No
APP Name: device unlock app

i have this asus device and when i try to unlock bootloader device just reboot but bootloader still locked, i need it in urgent and very badly,

in this thread this person unlocked it, but idk which version he used,


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