If using the ResearchDownload tool seems too technical, consider these alternatives, though they are less powerful than a full flash:
Nokia G21 uses Dynamic Partitioning. Do not use "Format All + Download" unless you want a hard brick (no IMEI).
You should consider using the Nokia G21 Flash Tool if you encounter any of the following scenarios:
Your Windows PC cannot communicate with the Nokia G21 without the correct drivers. For Unisoc devices, you need the Spreadtrum USB Driver (often included in the SPD Research Tool folder). Without this, when you connect the phone, it will disconnect instantly or show as an "Unknown Device."
