[ASK] How to Unlock Bootloader and Root on Latest Oreo Firmware?

edited September 2020 in ZenFone Max Series
Model: ZC553KL(Max)
RAM: 3GB
Firmware/App Version: FW WW_15.0200.1812.503
Location: Indonesia
Frequency of Occurrence:
Rooted: No
App Name:
Description: Unlock Bootloader and Rooting Help

Hello, I recently got my hands an Asus Zenfone 3 Max (ZC553KL) for free, which is a pretty good deal. Anyway, the first thing I do with it is update it to the latest version (FW WW_15.0200.1812.503). Now, I want to root my phone with Magisk, but realize all guide on unlocking bootloader requires Nougat FW. do I need to downgrade? if yes, how do I update and root it so that I could use Oreo with Magisk on this phone?
Thanks in advance!
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