When you run AFTool for the first time, the program connects to Vivo's servers to fetch the latest firmware data for all supported phone models. This data is then written to the file.
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Disclaimer: Proceed with caution. Flashing custom or unsupported firmware can damage your device. This guide is for educational purposes. When you run AFTool for the first time,
Flashing an incorrect firmware package via Aftool can corrupt the bootloader partition, rendering the device completely unresponsive. rendering the device completely unresponsive.