Unable to install .apk from /system/priv-app

Question

I moved my apk file to /system/priv-app just as you adviced me in this thread. When I'm trying to install it through clicking this .apk, Android said me that "The application has not been installed". I tried to use adb install myapp.apk for this purpose but again ADB gave me an error: Failure [INSTALL_FAILED_POLICY_REJECTED_PERMISSION] and I suppose that app requires permission which can be granted only by root. So the only way I see now is to run adb shell later su next cd /system/priv-app and install [-cdDsp] [-o USER] [-g GRP] [-m MODE] [-t DIR] [SOURCE]... DEST and that's a point because I totally don't understand this legend: 




 Copy files and set attributes


 -c

Just copy (default)


 -d

Create directories


 -D

Create leading target directories


 -s

Strip symbol table


 -p

Preserve date


 -o USER Set ownership


 -g GRP  Set group ownership


 -m MODE Set permissions


 -t DIR  Install to DIR`


How to set attributes to install this apk as system app?


— Bartosz Królak | Sources

Answer

I think you misunderstand the whole process. You are not supposed to use install command or the likes of it anywhere in the process I mentioned. You simply:




  1. mount the system partition in rw mode

  2. copy-paste the apk into the location,

  3. set the appropriate permissions using busybox's chmod and chgrp or through inbuilt tools:



    adb shell su -c chmod 644 APK
 # replace APK with your apk's absolute location, such as /system/priv-app/xyz.apk
    
adb shell su -c chown root:root APK
# replace APK as said above

  4. do a reboot.




Follow those instructions religiously. You can altogether avoid the commands using a file manager app such as Solid File Explorer, ES File Explorer, etc.



During the following boot the Android would detect the apk and install it automatically.


— Firelord | Sources

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