Hello
excerpt from the manual on page 22
Reinstalling Channels
You can search for and reinstall channels while leaving all other TV settings intact. You can also perform a full installation of the television.
If a lock code is set, you will need to enter it before you can reinstall the channels
For the lock code
See the manual on page 19 - Parental Code
Forgot your code?
To enter a new parental lock code if you have forgotten the old one, enter 8888
The manual ==> https://download.p4c.philips.com/files/3/32phh4309_88/32phh4309_88_dfu_fra.pdf
Very hard to catch a black cat in a dark room.
Especially when it's not there...