Forgot PIN code on Sony Bravia KD-43X8309C TV

Hello everyone, I've forgotten the PIN code that is required to search for channels. I've tried resetting the TV, but it's still asking for a PIN code that I've lost. It seems that I had chosen some PIN codes for these functions because I've tried 9999, 0000, 1234 and nothing works. I've also looked in the user guide on the Sony website but couldn't find how to reset the PIN code or the TV, so I think I need to manually reset the TV, but I don't know how to do that. If you have any other solutions, I'm all ears.
Thank you for reading and for your response.