Most likely the person was trying to unlock the phone and downgraded with a custom rom and tried to update OTA.
How could i uninstall the custom rom and go back with the factory firmware.
My phone is in odin mode with custom and knox cout is 1.
Would I have to root my phone to do it or could i go into the setting using the down vol, home and power btn and wipe clean or would that mess everything up.
Also my phone have bad signal problems when in certain houses lol .
this is what my phone say.