Hi
famouzdave09Thank you for your asking. X008D=ZC520TL Please check the link below as ZC520TL firmware spot.
https://www.asus.com/Phone/ZenFone-3-Max-ZC520TL/HelpDesk_BIOS/Kindly read the description below the firmware file if you have encountered any update issue.
# Update Guide
https://www.asus.com/support/faq/1009748If you have any further queries, please do not hesitate to contact me.