Procedure
1. Open UnlockTool
2. Click Oppo Tab
3. Search: Realme c21-y spd
4. [SPRD] FACTORY RESET
5. HOLD Vol Up & Down then Connect USB Cable
1. Open UnlockTool
2. Click Oppo Tab
3. Search: Realme c21-y spd
4. [SPRD] FACTORY RESET
5. HOLD Vol Up & Down then Connect USB Cable