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Use a high-quality OEM cable. Always connect to a rear motherboard USB port if using a desktop PC. Check Windows Device Manager to ensure no yellow warning triangles appear next to the active COM port. 2. Error: "S_AUTH_HANDLE_IS_NOT_RECEIVED" (MTK Devices)

If you are looking for specific drivers, need troubleshooting for flashing errors, or want to discuss a particular Vivo model, Use a high-quality OEM cable

Comprehensive Guide to AFTool BBK 5.1.31: Features, Usage, and the "UNSPT LISTBIN" Fix need troubleshooting for flashing errors