System Application was uninstalled and could not be recovered in android I have rooted my device. I have installed crDroid-7.1.2-20171202-j5nlte-v3.8.3 and android 7.1.2

I am using j5nlte model of samsung.
I have accidentally uninstalled contact and contact storage applications since my device was already rooted.
After the uninstall process, I have installed simple contacts application from f-Droid
When I am willing to create a new contact I could not create the contact and the system says

No app from this device


As I think, the problem was "contact storage application was uninstalled".
I have downloaded below application to install the contact storage application. I could not installed and the error was 

The package conflicts with an existing package by the same name


I can restore the device to get my system apps but I can't restore since I have some other issues.

Is there any way to get my system apps back. Do I have any method to save contacts without contact storage apk?
Afraid you need to re-install your ROM. Until you can do that, you can e.g. use OpenContacts from F-Droid. This is an addressbook/dialer that comes with its own contacts storage no other app has access to (privacy-focused), so it should work in your current situation.