Go to
https://f-droid.org/en/packages/org.fdroid.fdroid.privileged.ota/
download the latest package and do gpg signature verification
tmp=$(mktemp -d) && cd $tmp wget https://f-droid.org/repo/org.fdroid.fdroid.privileged.ota_2110.zip unzip org.fdroid.fdroid.privileged.ota_2110.zip
Activate ADB root shell under developer settings on your phone.
Install the packages
adb root adb remount adb push F-DroidPrivilegedExtension.apk /system/priv-app/ adb push 80-fdroid.sh /system/addon.d/ adb push permissions_org.fdroid.fdroid.privileged.xml /system/etc/permissions/
Install normal user space F-Droid and reboot your phone.
Done.
You should be able to see “Automatically install updates” in F-Droid settings.
Don’t forget to disable ADB root shell again.