How to reactivate

I have a wired floodlight camera in our driveway. It suddenly started randomly flashing its lights, but only occasionally, and with no pattern - just off and on repeatedly. Tried numerous things to stop it, and finally Deactivated it, thinking it would re-boot. But now I can't get it to re-activate! Everything I've researched says to find the QR code, well that's long gone in the packaging years ago. There must be an easier way to just reactivate this thing, what am I missing??