I've noted the hacks out there for PS4; most of them involve completely bypassing the PS4's root-level security. Some involve access via USB, others may be remotely installable. For a time, unknown persons had access to my PS4 physically.
I've noticed remote-play like effects and other local problems while playing games that didn't exist before. I'd like to know if there's a way to see if the original firmware and/or certificates, etc, are in place.
Best Answer
To be on the safe side, you should use the PS4 Recovery Mode to re-install the system software via USB (Option 3). You should only download the official firmware update from https://www.playstation.com rather than rely on third-party or unofficial sources.
If you want to be extra safe, you should do a full backup of the console to a external hard drive and then reset the PS4 using Option 7 from the PS4 Recovery Mode. This will delete everything on the console, including the system software, saved data and games, so use with caution. Once reset, you can either restore your backed-up data or download your games again.