Release Notes
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Here’s my build of LineageOS 17.1 for Raspberry Pi 4 Model B and Pi 400. It is unofficial and unsupported by the LineageOS team. It’s for advanced users only. Pi 4 model with at least 2GB of RAM is required to run this build.

Important! This image includes parts that are licensed under non-commercial license (Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International). You may use this build freely in personal/educational/etc use. Commercial use is not allowed with this build!

lineage-17.1-20201120-UNOFFICIAL-KonstaKANG-rpi4.zip
https://www.androidfilehost.com/?fid=10763459528675587733
md5:9c3567aa6ae41931c9c02ae997f8775c

Working:

    Audio (HDMI, 3.5mm jack, USB microphones, bluetooth speakers/headsets, etc)
    Audio DAC (using PCM512x DACs e.g. Hifiberry DAC+)
    Bluetooth
    Camera (using official Pi camera modules & UVC USB webcams)
    GPIO
    GPS (using external USB modules e.g. U-Blox 7)
    Ethernet
    Hardware accelerated graphics (V3D)
    HDMI display
    I2C
    IR remotes (using external GPIO IR modules e.g. TSOP4838)
    RTC (using external GPIO I2C modules e.g. DS3231)
    Serial console (using external GPIO serial console adapters e.g. PL2303)
    SPI
    Touchscreen/multi-touch (USB touchscreens, Waveshare SPI touchscreens, official 7” touchscreen using SwiftShader software renderer)
    USB (mouse, keyboard, storage, etc)
    Wifi
    Wifi tethering
Not working:

    Hardware video decoding & encoding (software decoding & encoding works)
Issues:

    Stock camera app is not working - many third party camera apps seem to work
    SELinux is in permissive mode
    and more…

Thanks:

    Peter Yoon and everyone who has contributed to android-rpi
    brobwind for bluetooth fixes
    Roman Stratiienko and GloDroid project for graphics fixes
    Eric Anholt for V3D graphics driver
    Maxime Ripard for Pi 4 KMS driver
    Google for Android Things platform
    Android-x86 project
    LineageOS team & everyone who has contributed to LineageOS 17.1