Unknown numbers on screen and Information Security Solution pop-up

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Android Central Question

hello,
I have on my screen (left and right) some strange numbers. Also, an Information Security Solution screen pops-up ever couple of seconds. I did factory reset form both Settings and by pressing buttons, still have them. Why do I have this, how to eliminate them? Sorry, it seems I cannot attach screenshots.
Thank you,
Liviu
 
Looks like something downloaded, look at most recent apps installed , also put in safe mode to see if goes away to know for sure if 3rd party app causing this .
 
Welcome to the forums. Did you buy this phone new or second hand? When did this screen appear? Was it the first time you used the phone or after any process that you performed?
 
It looks like the device was originally a pre-release test device. I'm not sure if you can get rid of that. You could try flashing a stock ROM for it.