: Power off your VFD 210. Connect it to your PC via USB. (Tip: You may need to hold the Volume Down or Volume Up button while connecting for the PC to recognize it).
Once you have downloaded the firmware and extracted the tools, follow these steps:
: The VFD 210 is sensitive to "preloader" flashing. It is generally recommended to uncheck the "Preloader" option in SP Flash Tool unless you are trying to unbrick a completely dead device, as flashing the wrong preloader can permanently brick the phone.