: Turn off your phone, then connect it to the PC while holding the boot key (usually the 'OK' or center button for feature phones).
This guide provides a comprehensive overview of how to download and install the Symphony B66 flash file to restore your device to its factory state. What is a Symphony B66 Flash File? symphony b66 flash file link
Install the MTK USB VCOM Drivers so your computer recognizes the phone. : Turn off your phone, then connect it
This is a specialized database for phone firmware. : Turn off your phone