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.
You get the benefits of standard Android, combined with useful LineageOS tweaks like status bar customization, advanced button mapping, and system profiles. Important Prerequisites and Risks
This comprehensive guide covers everything you need to know about running LineageOS on your Asus Zenfone 9, from preparation to the final installation steps. Why Flash LineageOS on the Zenfone 9?
The side fingerprint scanner is actually on Lineage OS than on stock. The Smart Key (the button above the volume rocker) can be remapped via Settings → System → Gestures → Smart Key. I set "single press" for Flashlight, "double press" for Screenshot, "long press" for Google Assistant.
: Attempt to locate and use the official ASUS bootloader unlock tool. Install it like a regular app and follow its on-screen prompts. Due to the current unavailability of the tool, this step is the most likely point of failure.
Post‑installation tips
The Zenfone 9 is one of the few modern flagships with a 3.5mm headphone jack. Enthusiasts who care about audio hardware often overlap with the crowd that prefers custom ROMs. LineageOS includes a robust AudioFX equalizer that maximizes the utility of that headphone jack.