ASUS Zenfone Max Z010d - Bootloop problem
Aside from ADB sideloading, there is a direct option on the phone called &quot;Apply update from SD card&quot; after entering fastboot mode. Maybe, you should try that.

Enter fastboot mode by pressing the Volume down and Power button at the same time.
Once you reach the main menu, look for the above specific option.
On the SD card, the correct firmware zip file required for your phone should be present. Do NOT rename it or alter it.
After entering the option, locate the firmware file on the SD card and select it, apply the changes.

If the problem still persists, I think you should dig deeper into how to unlock the bootloader of your phone.