I had an LG Optimus I phone (LG E410f) with Android (can't remember the exact version now, but I believe it was 4.1.2) -- and I had OI Notepad pp installed (app home is here). There were some very important notes saved on that notepad, but I accidentally did a factory reset while trying to boot into recovery (as far as I remember I did boot into recovery, but now everytime I boot it, the phone will start the initial setup again). I did not finish the initial setup after the accidental factory reset, so as to not overwrite any data in case it's possible to recover.
The device was rooted prior to booting into recovery (but I did not install alternative recovery/os/anything -- I just used some apps that needed root access).
So, my question is: is there any way to recover the app data?