Copied an app and now original doesn’t work properly

how did you copy the app?

 

You would need to reinstall the app., because it would be calling on system files to work and would have installed some of its own necessary information into processes to call on the OS. Copying the file would not copy all of that.

 

I am only guessing, but I wonder if the problem is that the unit is running Android 4.4, an OS that is very much out of date.
Are you able to contact the app vendor (or find it on the Play Store) to see if it can be still used?
Launch is not the same as install. Once the app is installed, you then launch (run) it .

 

Sorry, I do not know how to do that on your set-up with the custom made app.

 

You can't copy an app.
You can copy the apk of the app, which allows you to install it again on a device.
Any thing you are seeing on the unit are icons or remnants of what was, but technically it's gone.
You would need to reinstall the app using it's apk file, and since it sounds like you cannot install, ....

 

Are you sure that you actually uninstalled the original?
Does the file manager let you see how much memory a file is taking up?

This can let you see if the app still exists or not.

 

It appears that there is no need to reinstall it.

So, as far as you know, nothing was uninstalled or deleted?

Perhaps a restart of the system is in order.

 

Be aware, that you may need to consult the owner's manual of the car, as many unexpected things can happen if the only way to restart the system is to disconnect the battery.

For instance, on my mother's 2002 Honda, if the battery is unhooked or goes dead, a number must be entered into the radio or else it will no longer work.

I have seen other ridiculous 'security' features on other vehicles as well.

 

What vehicle is this system installed in?
There should be some way to restart it.

If it is not addressed in the owner's manual, then it should be included in a service manual or a repair manual (such as Chilton's) for the vehicle.

If all else fails, then a trip to the dealor may be in order.
As dealors tend to be expensive, I would use this as a last option.

 

Another thing, possibly a shot in the dark here-

Maybe the unit has some sort of back up battery inside of it.

This can make it impossible to restart the unit by mearly disconnecting the vehicle's battery.

Unfortunately, I think that a trip to a dealor for the make of vehicle may be the quickest way to remedy the situation.