Warning: The HTC One A9 is no longer maintained. A build guide is available for developers that would like to make private builds, or even restart official support.
Special boot modes
Recovery: With the device powered off, hold Volume Down + Power until the bootloader appears, then release the buttons. Use the volume buttons to scroll to “RECOVERY” and press Power to select.
Bootloader/Fastboot/Download: With the device powered off, hold Volume Down + Home + Power.
Find help online
You can find assistance with LineageOS on our subreddit, or in #LineageOS on Libera.Chat.
Note: This page is auto-generated for the HTC One A9, based on the device’s information, located here. You can find similar instructions for every officially-supported device on this wiki.