For a week now instead of "ok" and "back" it says other things and anstadt, dualshock "it says something else too. Everybody knows what you can do there because I wanted to sell the Ps soon and so nobody wants to buy them.
Restart and if that doesn't work, reset.
1) Wait for the next update and hope that it goes away.
2) If that doesn't work: Call up PlaystationSupport
https://www.playstation.com/...-software/
https://hardware.support.playstation.com/de_DE#/
3) Reset your Playstation after you have saved all your saved data on a stick (a PSNetwork account is important then)
Or if you want to sell it, you reset everything anyway, then it doesn't matter anyway - this is a bug in the software that is guaranteed to go away when you reset it