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This video will show you how to flash BLHeli to the ESCs on your Eachine Falcon 210. The ESCs on the Falcon are not great, but they can be improved by replacing the Flycolor firmware they come with, with BLHeli. In order to do that, you have to flash the ESCs over the C2 interface. The C2 interface is how you program the Silabs chip on the ESC directly, vs. over the signal wire like you usually do it. Once you have flashed BLHeli to the ESCs the first time, you can do it over the signal wire via BLHeli passthrough after that.
If you want to flash BLHeli to any other ESC, the steps are the same, but this video specifically targets the Eachine Falcon 210.