Asus bootloader unlock tool not working

- Model Name: Asus Zenfone Max(z010d)
- Firmware Version: MMB29P.WW_Phone-13.8.26.110+2018011060020723_201603030037
Have been trying to unlock bootloader for a long time. Unlock tool shows communication error.
Tried fastboot commands to no avail.
Thanks in advance.
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