Your Zenfone 9 will now boot into LineageOS. The first boot may take a few minutes. Once the setup wizard appears, you can configure your Wi-Fi, restore your data, and enjoy a private, clean, and incredibly fast Android experience on your compact flagship device.
ASUS provides an official bootloader unlock tool, though its availability can occasionally fluctuate based on server maintenance. Go to the official ASUS support website for the Zenfone 9. Download the (an APK file).
Disclaimer: Modifying your device firmware voids your warranty. Proceed at your own risk. Step 1: Unlock the Asus Zenfone 9 Bootloader Asus provides an official bootloader unlock utility. asus zenfone 9 lineage os
: Obtain the official or stable unofficial LineageOS ROM zip, Lineage Recovery image, and optional GApps (Google Apps) package from trusted sources like XDA Developers or the official LineageOS website. Step-by-Step Installation Process Step 1: Unlock the Asus Bootloader Asus provides an official bootloader unlock tool.
You must use the official ASUS Bootloader Unlock Tool . Note: This may void your warranty. Your Zenfone 9 will now boot into LineageOS
The ASUS Zenfone 9 is a compact flagship that punches well above its size: Snapdragon 8+ Gen 1, a bright 5.9-inch AMOLED, stereo speakers, and a surprisingly big battery in a small chassis. For a certain kind of enthusiast—someone who prizes control, longevity, and a stripped-down software experience—installing LineageOS on the Zenfone 9 is an appealing proposition. But is it the right move for most users? This editorial walks through the rewards, the trade-offs, and the practical realities.
Not official (as of April 2026). The Zenfone 9 is not listed on the official LineageOS devices page. However, highly functional unofficial builds exist. ASUS provides an official bootloader unlock tool, though
: The custom ROM scene for this specific model is considered "dead" by many in the community. Only a few older builds of alternative ROMs like OmniROM or AOSPA exist, but they have not been updated recently. Why Support is Lacking Small Community
ASUS traditionally offers two years of major Android updates and two to three years of security patches. Once that window closes, your phone becomes vulnerable to exploits. LineageOS provides regular, community-driven security updates long after the manufacturer abandons the device, allowing you to safely use your Zenfone 9 for years to come. 2. Ultimate Privacy Control
entered the market as a breath of fresh air. In an era of massive phablets, it offered a 5.9-inch display, a top-tier Snapdragon 8+ Gen 1 processor, and a headphone jack—a combination almost unheard of in premium devices. For many, it was the perfect "forever phone," limited only by Asus’s relatively short official software support window of two years. This limited lifespan is precisely what makes
Enable on your phone by tapping Build Number seven times in Settings. Toggle on USB Debugging and OEM Unlocking . Connect the phone to your PC.