A software update shouldn't affect your pictures. I'm sorry to hear this has happened to you. 😔
I assume you use Samsung Gallery ?
Open your Samsung Gallery and tap on view all.
And then look to see if your photo's are still there.
Also tap on the 3 little dots in the top RH Corner and choose the select which albums to show.
Also in the bottom RH Corner press the icon with 3 lines and look ar the recycle bin.
If you use Samsung One Drive to backup then hopefully your photo's will be stored.
I personally use Dropbox
It's always advisable to use some option to back up just incase.
If I can be of any further help then please don't hesitate. Take care. 😎
Daily Driver > Samsung Galaxy s²³ Ultra 512Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "