Question about TVIP S-Box v.605 WiFi, Black

Hello people Is there somewhere (on the net) a manual for this little box. The one I got contains almost all the languages in the world, but stops when it gets interesting. So I found out in a roundabout way that you can reset the box by pressing the keys (in order and nothing together) sinfo, 4, 9, sinfo. I operate the box on a TV set. The only aim is to show my films from my NAS. The TV set is set to "16:9" or "auto" and displays all films correctly. I also managed to get this box to find my NAS (via wifi, thick signal), BUT: two problems:# 1. the film is jerky (perhaps this can be solved by replacing WLAN with LAN) 2. the films on the NAS are in 16:9 and are also displayed correctly on other end devices. Here they are displayed - distorted - in 4:3, which cannot be changed on the TV set. Does anyone have any ideas?