unauthorized actions have been detected.

[AC Question]

I bought a Galaxy S6 with 5.1.1 installed,

I constantly receive the following message - Unauthorized Actions have been detected. Restart your device to undo any unauthorized changes" (restart doesn't change anything)
Phone won't remember WiFi settings and password, I have to continually type in WiFi password when connecting
When trying to install My Knox, I get the following warning "My KNOX cannot be installed because a custom OS has previously been installed on this device."

Can someone please help me this message is very annoying as it keeps popping up like every 10-15mins.

 

[Arab504]

I have LITERALLY the same exact issues! Any help would be nice.

 

[Javier P]

Welcome to the forums. I'll move this thread to the S6 forum where it'll be easier getting help from other owners.

 

[Westiemom]

Did you buy your phone from someone used? If so, maybe the previous owner had rooted the phone. That's what it sounds like from the Knox message. I would want to return it.