Erase all pics - Nikon COOLPIX L20 Digital Camera

Have you written anything new on this camera memory card since then?
As I know, the deleting process generally won't erase everything on your camera memory card. All these deleted pictures are still there and only become inaccessible and invisible. As long as you've not overwritten them with anything else, they even can be there forever.
So, you'd better restore them back from this camera memory card as soon as possible.
What you should do is really simple:
1). Stop using this digital camera immediately.
2). Plunge this camera to your computer.
3). Use a camera data recovery freeware that can deeply scan your card and get back your lost photos as many as possible. In fact, this freeware has ever helped my friend retrieve all his inaccessible data back successfully. It can be a really great chance for you.
Read more detailed information here:
http://blog4mark.blogspot.com/2012/12/photo-recovery-after-delete.html


4). Save and back up all the restored photos on a different memory card or drive in case of data recovery failure.

The best way to recover erased pics is to use photo recovery software, I'd recommend asoftech photo recovery as it helped me before. You can refer to this tutorial that helped me before
Recover deleted files

What do you want to ask?
erase sll photos and want to recover them? If so, you can try some photo recovery program to help you get them back.