Based on the information above, here are my tailored recommendations for different user needs:
A classic industry staple. It requires a physical hardware box and is known for its extensive database of Samsung firmware and repair capabilities. samsung imei repair tool
Install Samsung USB drivers and the Z3X loader. Disable Windows Driver Signature Enforcement (Shift + Restart > Troubleshoot > Startup Settings). Based on the information above, here are my
They clear the corrupted EFS partition, forcing the phone to rebuild a blank, generic EFS structure upon reboot. Based on the information above