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How to remove SuperSU on unrooted phone? - "there is no SU binary installed..."

Hi,

I lost some SMS data. I tired to use data recovery software. One of the programs was Fonepaw. Apparently fonepaw tried to root my device and failed; or did something else. Yet, somehow fonepaw installed SuperSU as a system application. This is causing problems with the device, a Galaxy S5 (SM-G900V) running Android 6.0.1.

When I run the SuperSU application it reports:

"There is no SU binary installed, and SuperSU cannot install it. This is a problem!"

My only option is to select 'OK'. Which closes the app.

SuperSU won't uninstall via application manager due to being a system application.

The "adb backup" command no longer works since my attempts at using Fonepaw and a few other applications.

ADB see's my device via "adb devices". I can explore directories. If I enter "adb shell su" I get "root@kltevze:/ #".

But when I try to run "adb backup" the phone doesn't go into the prompt where you say 'okay' and set a password. Adb backup has worked just fine in the past. It's been useful, and I need to use it again as part of changing to a new phone.

Android also is showing in notification a "Security notice" stating "Unauthorized actions have been detected. Restart your phone to undo any unauthorized changes."

Restarting does nothing. Even booting to safe mode doesn't stop the security notice. SuperSU being a system app runs in safe mode.

Root Checker app comfirms the phone isn't rooted.

I have never attempted to root the phone and have been the only owner/operator.

I would like to uninstall the SuperSU application and any data it stored on the phone without losing any data on the phone. Since the phone is not rooted and no SuperSU binary was installed, I'm hoping this is possible.

My search for information has provided limited insight.

I'm hoping someone on XDA might know what to do.

Edit: Additional info.

https://android.stackexchange.com/questions/103611/remove-su-after-unroot

I do the following:

"root@kltevzw:/ # cd system/xbin"

"root@kltevzw:/systems/xbin # ls"

output:

"Dexdump

dexdump

jack_connect

jack_disconnect

jack_lsp

jack_showtime

jack_simple_client

jack_transport

jackc

su"

The commenter at stack exchange would suggest the phone I have has root, but root check says otherwise.

Another edit:

I'm not sure, but it looks like a Custom Recovery was installed on the phone. Unsure if that's what came with phone or not, vol down+home+power brings me to a screen without the "Android" icon/statute/person thingy. Same for booting into vol up+home+power. However, in the recovery I get 'reboot to bootloader' and when I select that I go to stock android download mode/odin mode. And when I boot the system, boot/splash screen "Samsung Galaxy S5" on top, a lock icon that is unlocked with "Custom" in the middle, and "powered by Android" at the bottom.

command "adb root" returns "adbd is already running as root".

So, I'm not sure what's going on here. Found a post stating you can have adb root without root in androids system. So...I'm a noob at all this. *CONFUSED*. Hoping for someone to help.

Fonepaw support has not been helpful at all.