SPI Receiver Option1: Crazybee F4 Lite FC built-in Frsky SPI D8 RX 1. SPI Receiver Option2: Crazybee F4 Lite FC built-in Flysky SPI RX 1. (Frsky SPI RX version) CRAZYBEE F4 Lite Frsky version Firmware target: CrazybeeF4FR.
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