I recently installed MalwareBytes on my tablet and it found Android/PUP.HackTool.DeviceAlive.a in /System/app/com.customermobile.nook.apk MalwareBytes says it can't delete it. The file seems to be a part of a program called Nook Demo that's preinstalled. I've tried factory resetting my Nook HD+ a number of times but after a few hours this keeps coming back is this a false positive? These are the other antivirus programs I have tried and they all come back clean. Avira Antivirus Security (Avira) Bitdefender Anti Virus Free (Bitdefender) AntiVirus FREE - Security Scan (AVG Mobile) Antivirus & Security (AVAST Software)