1. Open Unlocktool
2. Select Vivo
3. Click Vivo Y91C (1820)
4. Click Factory Reset + FRP
5. Off Unit then Insert USB Cable / No Bootkey mga Boss
2. Select Vivo
3. Click Vivo Y91C (1820)
4. Click Factory Reset + FRP
5. Off Unit then Insert USB Cable / No Bootkey mga Boss