Since I had applied immediately a new image that gives me more opportunities, I can not go farther than this. With OpenPLi image 4 the device is going very well. My WLAN Stick (TP link) was not initially recognized, but by the daily updates and downloadable plugins / drivers the problem has been resolved quickly. The connection of an ext. Hard disk works fine and playing movies (MKV, XviD, etc) also goes.
Unlike my Dreambox DM7020HD I can only say that the ET4000 is felt more quickly, an excellent color picture. The narrow remote control has also convinced me that I better find the assignment of the keys here than in the Dreambox.