stands for International Mobile Equipment Identity . It is a 15-digit unique identifier assigned to every mobile phone. Think of it as your phone’s fingerprint.

Many Samsung repairs involve replacing the main motherboard. If your device had a critical hardware failure or a "blacklisted" IMEI due to a previous error, the repair center may have replaced the board. A new board comes with a new IMEI. In this context, "IMEI fixed" means your device has been assigned a clean, working serial number and is ready for use.

From user reports (XDA Developers, Reddit r/Samsung, and Irish consumer forums):