https://www.sony.co.uk/electronics/support/articles/00122829

NOTES:

• The factory reset may take a few moments. Please wait until your're informed that the process has been completed 
• If you had set a PIN-code on your TV, you will be asked to enter this PIN-code when you select the option "Erase everything"  

When I am roessing "Erase everything"  is asking for  a PIN-code but I never set a PIN code, maybe my kids, but they don't remember.

How do I perform a factory reset on Sony's Android TV if I donlt know the PIN-code that I need to fill ?

Kind Regards

Eugen