The "Nokia Security Code Removal Tool v1.8.4" is a legacy utility designed for older, feature-phone-era Nokia devices (DCT3, DCT4, and some BB5 models) to reset or calculate master codes to bypass user-set security codes.

The tool generates a master code based on the phone's IMEI number to bypass security codes (lock codes) when the original code is forgotten.

Because the original developer no longer supports this tool, downloading it from third-party sites carries a high risk of bundling with malware or viruses.

Online calculators can perform the same function as the software without requiring a download.