Eachine Racer 250 Drone Spare Part Simonk 12a Esc 2-4s

Eachine Racer 250 Drone Spare Part Simonk 12A ESC 2-4S How to flash the ESC to BLHeli firmware? Please refer to the video below: Description: Brand: Eachine Item name: Simonk 12A ESC Weight: about 9g BEC: no Usage: for Eachine Racer 250 Drone Package included: 1 x Eachine Simonk 12A ESC 2-4S