Eachine Racer 250 FPV ARF - Flashing to BetaFlight firmware

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Thanks to Boris B. for his amazing work on BetaFlight! Here's my brief guide on installing BetaFlight 2.1.3 onto the CC3D flight controller of ER250. I also did basic configurations with the latest CleanFlight Configurator 1.00.
Contents: Outline of the procedure to flash from CleanFlight to BetaFlight firmware. If you're flashing from OpenPilot directly to BetaFlight, then you need to watch CleanFlight setup videos to learn about the other configurations that are missing from this video.
Music: Electric Rain by Eric Matyas.
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