dji go 4 app moded version

[Bloxx]

hi i have the dji go 4 app mod lite ,thing is when i get around 1200 meters away the rc logo in the app disappears any one any idea what thats all about im in the country only farmland and woods although there is an airport not to far away,i have moded my mavic pro firmware which includes no fly zone removed so thats a blesing as before i could not take off but now its all good ,having said that i went to fly today and i could not take off i was amazed so i saw a video on you tube where you could unlock via dumldore app i unlocked the mavic and happy days i could fly again but the problem remains every time i get more than 1200 meters the rc logo disapears on the moded dji go 4 app is this normal anyone else having this any advise please thanks in advance all