In LineageOS Recovery, select and then Format data/factory reset . Confirm the action.
I finally took the plunge and unlocked the bootloader on my Zenfone 9. Here's my experience after 7 days on the latest Lineage OS 22 (Android 15):
LineageOS builds for the Zenfone 9 are highly stable, but switching to a custom ROM involves a few hardware and software adjustments: asus zenfone 9 lineage os
The ASUS Zenfone 9 is a rare gem in the modern smartphone landscape. Released as a compact flagship, it won over power users with its pocketable 5.9-inch form factor, top-tier Snapdragon 8+ Gen 1 processor, and the inclusion of a 3.5mm headphone jack.
The 120Hz high-refresh-rate display, physical side-mounted fingerprint scanner, 5G connectivity, Wi-Fi, Bluetooth, and standard audio functions work out of the box. In LineageOS Recovery, select and then Format data/factory
There are a few things you lose or must handle differently compared to the stock ASUS firmware:
Install the APK on your Zenfone 9 (ensure "Install from unknown sources" is allowed). Here's my experience after 7 days on the
Using the adb sideload command from your computer, you will flash the LineageOS installation zip file.