Thank you all for your answers!
i should look for it: wallet.dat (but im not sure).
I'm not sure the name of the application but it looked like on this screenshoot.
Unfortunately, I didn't keep (no SEED ;/) the keys because they were not.
At that time there were no seeds yet.
According to this topic (my case) :
https://bitcointalk.org/index.php?topic=2855646.msg29303562#msg29303562and photo (my screnshoot made before factory reset):
Once I copied "manually" [ctr+c /ctr+v ;/;/] photos and other files before factory reset)
It was 2014 - 2015. Phone, Samsung Galaxy s4