f-droid
fdroid.apk
fdroid privileged extension
With the ever changing Android ecosystem its getting harder to enable F-Droid with background upgrades.
adb reboot recovery -> adb push priv-ext-OTA.zip /sdcard -> install from recovery use to be the gold standard. Sometimes you would need to install F-droid.apk manually flashing teh OTA zip, and sometimes you'd also need the privileged-extension package from the F-droid store.
Now you must manually mount /system before flashing the zip
adb reboot recoveryadb shell mount /systemadb push priv-ext-OTA.zip /sdcardinstall.zip from recovery