: The official Samsung authorized service centers should always be the first point of contact for carrier unlocking or any factory reset issues. If your device is out of warranty, platforms like Z3x Samsung Tool or Octoplus Samsung Software have long-standing reputations and large communities of users who can attest to their reliability. These tools require appropriate hardware (usually a specialized box and cable) and a one-time purchase, but they are trusted by thousands of repair professionals worldwide.
the emergency dial pad on the device and enter the test mode shortcut ( *#0*# or *#*#88#*#* ). Gsmkhmersolution.net