the bootloader unlocking tool (official) does not work. (on my ZB603KL does not have the OEM unlock option)
ZB602KL (4/64) Sorry.
The XDA Forums For Max Pro Series, Are very well developed in case of bootloader unlock solution, Rooting And Custom Recovery Installation and other superuser stuffs.
Here, Give the Unofficial Method a Shot:
I already tried the unofficial method for the ZenFone Max Pro M1, but a file link is not working and I can't find another one. the link is the first file on this XDA page: