New answers tagged call-screening
You can move apps to the /system directory so they will not be uninstalled after a factory reset. (For example an app that locks the internet browser). However, it is still possible to install apps by using the Play Store, ADB, or root access. Whatever you do, if you reflash the firmware, everything will be wiped and you can start over again. So the /system ...
The solution is to move the firewall and applock to /system/priv-app so the apps boots even in safe mode
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