Open the tool's executable file (often named uni SPD.exe ).
Use 7-Zip to extract nokia_spd_v10.7z to C:\Nokia_SPD_Tool\ (Avoid spaces in folder names).
Turn off your phone. Hold the "Boot Key" (usually the center button on feature phones or Volume Down on smartphones) and plug it into the PC.
: Install necessary SPD USB drivers on your PC to ensure the device is recognized.
A concise feature specification for "Nokia SPD Unlocker Tool v10" intended for development planning and documentation.