Stuck in Connection

i try to root my LG TV but it stucks on connection. I had the Developer Mode app installed and uninstalled it. I then tried to root my TV but it didn't work. Then I reset my TV to factory settings but that didn't help either.

LG TV: LG OLED55C37LA
Software: 03.30.76
webOS: 8.3.0-1510
InternetConnection: Lan