Open the extracted Flash Tool folder and launch the application (usually named UpgradeDownload.exe or ResearchDownload.exe ). Load the Firmware: Click the Load Packet

If your Nokia G21 is (most are), SP Flash Tool will still work because it operates at the hardware level (preloader/brom). However, after a "Format All + Download", your device will lose IMEI numbers and you will need a tool like Maui Meta or SN Writer to restore them – which requires an authorized account.

A file selection window will open. Navigate to the folder where you extracted the Nokia G21 stock firmware. Select the large .pac file and click .

Match Version Numbers: Ensure the firmware version you are downloading is compatible with your specific Nokia G21 model variant.