Hi guys am a newbie here and a newbie in messing with android firmware,bootloader,Rom,kernel etc. I happen to have my hands on a prototype of samsung galaxy S4-Korean SHV-E300S.Yes the mighty Samsung Exynos 5 5410 Octa *4+4 1.6GHZ. I got the device from a friend and it was in a wanting state. The IMEI is a 15 zeros number block,it has no roaming services and gets no network from any service providers,wifi is ok. However there is a constant floating,transparent and irritating window on the homescreen and app drawer that shows. PDA(MG2),PHONE(MG1),CSC(MG2),H/W,RF Cal Date, SMD,UN,Memory, Rear CAM, Front CAM,TSP,TSK,Sensor Hub,CH and BATT_LEVEL details. I downloaded rootchecker and the device is not rooted. I tried rooting,flashing stock firmware and bumped onto''Knox Images Only''every time.Jumped forum to forum studying knox en now am here. Is there a way to get the device to get network back(GSM,2G,3G,LTE)and also get rid of the annoying window on the homescreen. Forget about rooting it for now.