In this video we look at how you can quickly reset a Playstation 4 back to factory defaults via the Safe Mode options.
Please note that this process will return the console to the same state it was in, out of the box i.e. it will delete all Sony Entertainment Network (SEN) accounts, games, game saves data and media files.
It will not revert your console to a previous firmware version.
Before initialising the PS4 make sure you have backed up all your games saves to your SEN account.