The ASUS Zenfone 9 (codename: sake) has excellent support in the LineageOS ecosystem. Because the device uses a mostly stock Qualcomm chipset and ASUS was relatively developer-friendly (providing kernel sources), the port is considered very stable.
Official Support: The Zenfone 9 is absent from the official LineageOS device list [21].
Option 4: Quick Status Update (Discord / WhatsApp Status)
Installation Overview
Disclaimer: The following is for informational purposes. Modifying your device carries the risk of bricking it and voiding your warranty. Proceed at your own risk.
bootloader has become increasingly difficult as ASUS has disabled their official unlock utility
Step 5 (Optional): Sideload GApps