Factory Service Mode
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What is it
The PlayStation 4 can enter a special "Service Mode". When it does so, the bottom right corner of the screen has a red translucent rectangle with the words "F a c t o r y /Service Mode" inside of the rectangle. This mode is used by Sony for repairing assistance.
What Selfs does it use?
See Factory Service Mode Selfs
What PUPs does it use?
How to enter it
In a similar fashion to the PlayStation 3, one can enter FSM by patching the Syscon EEPROM (unknown values). There also may be a way to enter FSM using USB. There are documented cases of Sony repairing services accidentally leaving PS4 consoles in FSM.
Features
Unknown, supposedly more restricted than the PS3 FSM.