Is it a genuine phone out of the box or second-hand stuff? What's Knox's bit value, 00 or 01? Even if there was a successful attempt to unlock the bootloader that irreversibly sets the Knox bit to 01, which means - no more official updates from Samsung. Once Knox is broken down, there's no way to reset it because it's hardware protection on the phone's motherboard. And the phone becomes excluded from official support. Of course, provider software also matters. Depends on how rebranding has been made, and what software your phone actually got. Also is worth to check the official Samsung website for updates schedule for your model. Good luck!
