Zenfone 9 | Unlock Bootloader =link=
There have been reports of ASUS offering to unlock bootloaders for a fee (approx. $200 USD/185 EUR) at official service centers in some regions, though this is not a universally available or widely supported program. The Challenges of Unofficial Unlocking Because the
ASUS has officially for all mobile devices, including the zenfone 9 unlock bootloader
ASUS released firmware (specifically version 33.0804.2060.189 and later) that actively patches unofficial exploits and prevents firmware downgrading. There have been reports of ASUS offering to