I have my old iPhone and I don’t remember the passcode, I want to get my old photos without wipe the phone

Hello, I have my old iPhone 4 and forget the passcode, at the time I didn’t have enough iCloud storage to back up the photos and videos so I keep it for a long time, I found it and now I want to retrieve my photos but I don’t remember the passcode, how can I get back my stuff without to restore the phone and delete everything ?