_README.md

For forcing hfp client on Android 11:

su
setenforce 0
cp -a /system/etc/sysconfig /data/local/tmp/sysconfig
chown shell:shell /data/local/tmp/sysconfig

adb push override-enable-hf-client.xml /data/local/tmp/sysconfig/

mount -o bind /data/local/tmp/sysconfig /system/etc/sysconfig
stop
start

override-enable-hf-client.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- https://android.googlesource.com/platform/packages/services/Car/+/b53ae8d/car_product/build/component-overrides.xml -->
<config>
    <component-override package="com.android.bluetooth" >
        <!-- Enable sink profiles (typically used on a CarKitt) -->
        <!-- Controlled by profile_supported_hfpclient -->
        <component class=".hfpclient.HeadsetClientService" enabled="true" />
        <!-- Controlled by hfp_client_connection_service_enabled -->
        <component class=".hfpclient.connserv.HfpClientConnectionService" enabled="true" />
    </component-override>
</config>