SPECIFICATIONS OF FC      CPU: STM32F411CEU6 ( 100MHZ )    Six-Axis: ICM-20689/MPU-6000    Built-in Receiver: SPI ExpressLRS 2.4G    Receiver antenna: 2.4GHz SMD ceramic antenna    Size: 29mm x 29mm, fully mounting pattern compatible with the whoop frame in the current market    Firmware version: betaflight_4.3.0_STM32F411_norevision    OSD: Built-in BetaFlight OSD    Recommend VTX: >=200mW, like BETAFPV M03 350mW VTX or TBS Unify VTX    Power Cable: 55mm, with BT2.0 connector    Weight: 3.13g (no power cable included)      SPECIFICATIONS OF ESC      Power supply: 1S    Current: 5A continuous and peak 6A (3 seconds)    Support BLHeliSuite programmable    Factory firmware: O_H_5_48_REV16_8.HEX    Signal Support: D-shot150, D-shot300, D-shot600, Oneshot125, Multishot, PWM      Betaflight Firmware and CLI   Since Betaflight has not yet released the official firmware that could supports the SPI ExpressLRS protocol, the current version is the Beta version. Please use the firmware and the CLI dump file below to recovery the FC board if needed. Betaflight will update to their official target soon. Please feel free to contact with us if you have any issues with this Beta version Firmware.   It is normal that there is no any option on Betaflight Configurator Receiver. As show below, the checkbox is blank.      Please change the “PID loop frequency” to “4KHZ” , sometimes it would make the SPI receiver not working correct while the value is “8KHZ”.      Download the firmware and CLI dump file for the F4 1S 5A FC (ELRS 2.4G) board.   How to Bind with Betaflight FC with SPI ExpressLRS Receiver.   More details and discussion on Github about SPI ELRS receiver.   RECOMMENDED PARTS LIST      Battery: BT2.0 300mAh 1S Battery    Frame:  Meteor65 frame / Meteor75 frame    Props:31mm 4-Blades props(for 65mm frame) / 40mm 4-blades props (for 75mm frame)    Motors: 0603 motors / 0703 motors / 0802 motors    VTX: M03 25-350mW VTX      DIAGRAM   Larger motor pad for conveniencty solder directly.         PACKAGE         1 * F4 1S brushless flight controller (BT2.0 Connector)    4 * M1.2x4mm screws    4 * M1.4x5mm screws    4 * Anti-vibration rubber dampers