Now I have tried to flash the firmware you mentrioned but with same result as before. I also tried to flash e Os once again. SIM Status is the same. The only thing that made my attention now was when I wiped the phone in TWRP it says “Failed to mount ‘/preload’ (Invalid argument)” Does that message sound like something goes wrong? I followed this guide when I installed e Os: [HOWTO] Install /e/ on a Samsung smartphone with Windows easily