To perform any operation, the software must successfully establish a handshake with the phone:

Flashing and modifying mobile firmware carries inherent risks. Modifying or rewriting an IMEI number is illegal in many jurisdictions unless you are restoring the device's original factory-assigned number. Ensure you comply with local telecommunication regulations before using the repair features of this tool. Always back up the device's EEPROM and calibration data before initiating any write commands.

Standard Micro-USB or proprietary Samsung 2G RJ45 service cables Z3X Smart Card drivers + Samsung USB Mobile Drivers Step-by-Step Installation Guide