DeviceKeystring

Hello Ray,
Thank you for contacting us. This must to be a false positive.  
Open AVG Anti-Virus app.
Tap on Protection, you can see an option Update now. Tap on it and update.
Tap on scan and check the scan result. The issue must be fixed.

If the same is reported as threat again, please follow the below steps:

Tap on Protection
Near the Update now option, you will be displayed with few numbers (e.g 5.1.2 -1397498002-11634-4477), please take a screenshot of it.
Now go back to the home screen of AVG Anti-Virus app and tap on the three dots in the upper right corner.
Tap on help -> then tap About, you will be displayed with the version of AVG Anti-Virus app. Take a screenshot of it.
Also a screenshot of the threat detected by AVG.

After collecting the screenshots, visit this webpage http://support.avg.com/SupportArticleView?urlname=How-to-contact-support-through-the-Mobile-Contact-Form to fill in the form, attach the screenshots and submit it to our android support team.

Hello Ray,
Thank you for contacting us. This must to be a false positive.  
Open AVG Anti-Virus app.
Tap on Protection, you can see an option Update now. Tap on it and update.
Tap on scan and check the scan result. The issue must be fixed.

If the same is reported as threat again, please follow the below steps:

Tap on Protection
Near the Update now option, you will be displayed with few numbers (e.g 5.1.2 -1397498002-11634-4477), please take a screenshot of it.
Now go back to the home screen of AVG Anti-Virus app and tap on the three dots in the upper right corner.
Tap on help -> then tap About, you will be displayed with the version of AVG Anti-Virus app. Take a screenshot of it.
Also a screenshot of the threat detected by AVG.

After collecting the screenshots, visit this webpage http://support.avg.com/SupportArticleView?urlname=How-to-contact-support-through-the-Mobile-Contact-Form to fill in the form, attach the screenshots and submit it to our android support team.

Greetings-I received a warning to disable Devicekeystring.  My Samsung s7 will not allow me to do so.  any help would be appreciated. 
Ray